Update Base_Constant to return the singleton object for same static calls

[htdat]

Fixes #
See context in #7035 (comment)

I will merge this PR next Tuesday after the code freeze for verion 6.4 scheduled releasing next week.

Changes proposed in this Pull Request

• Update Base_Constant to return the singleton object for same static calls

Testing instructions

• All tests are passed.

---

• Run npm run changelog to add a changelog file, choose patch to leave it empty if the change is not significant. You can add multiple changelog files in one PR by running this command a few times.
• Covered with tests (or have a good reason not to test in description ☝️)
• NO NEED Tested on mobile (or does not apply)

Post merge

• Link to testing instructions from release testing doc following these instructions : Add link here / 'QA Testing Not Applicable'
• Add or update critical flows and testing instructions for critical flows, if applicable.
• Add what's changed (description, screenshot, demo videos etc.) to the release announcement post, if applicable.

[botwoo]

Test the build

Option 1. Jetpack Beta

• Install and activate Jetpack Beta.
• Use this build by searching for PR number 7064 or branch name update/base-constant-return-same-object-static-call in your-test.site/wp-admin/admin.php?page=jetpack-beta&plugin=woocommerce-payments

Option 2. Jurassic Ninja - available for logged-in A12s

🚀 Launch a JN site with this branch 🚀

ℹ️ Install this Tampermonkey script to get more options.

---

Build info:

• Latest commit: 1b3a801
• Build time: 2023-08-25 09:12:34 UTC

Note: the build is updated when a new commit is pushed to this PR.

[github-actions]

Size Change: 0 B

Total Size: 1.42 MB

ℹ️ View Unchanged

Filename	Size
release/woocommerce-payments/assets/css/admin.css	1.03 kB
release/woocommerce-payments/assets/css/success.css	158 B
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release/woocommerce-payments/dist/blocks-checkout.css	1.51 kB
release/woocommerce-payments/dist/blocks-checkout.js	73.5 kB
release/woocommerce-payments/dist/checkout-rtl.css	440 B
release/woocommerce-payments/dist/checkout.css	441 B
release/woocommerce-payments/dist/checkout.js	28.5 kB
release/woocommerce-payments/dist/index-rtl.css	35.6 kB
release/woocommerce-payments/dist/index.css	35.6 kB
release/woocommerce-payments/dist/index.js	283 kB
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release/woocommerce-payments/dist/multi-currency-switcher-block.js	60.5 kB
release/woocommerce-payments/dist/multi-currency.css	2.87 kB
release/woocommerce-payments/dist/multi-currency.js	55.6 kB
release/woocommerce-payments/dist/order-rtl.css	716 B
release/woocommerce-payments/dist/order.css	719 B
release/woocommerce-payments/dist/order.js	40.6 kB
release/woocommerce-payments/dist/payment-gateways-rtl.css	686 B
release/woocommerce-payments/dist/payment-gateways.css	688 B
release/woocommerce-payments/dist/payment-gateways.js	38.9 kB
release/woocommerce-payments/dist/payment-request-rtl.css	146 B
release/woocommerce-payments/dist/payment-request.css	146 B
release/woocommerce-payments/dist/payment-request.js	11.6 kB
release/woocommerce-payments/dist/product-details.js	789 B
release/woocommerce-payments/dist/settings-rtl.css	8.56 kB
release/woocommerce-payments/dist/settings.css	8.56 kB
release/woocommerce-payments/dist/settings.js	233 kB
release/woocommerce-payments/dist/subscription-edit-page.js	669 B
release/woocommerce-payments/dist/subscription-product-onboarding-modal-rtl.css	519 B
release/woocommerce-payments/dist/subscription-product-onboarding-modal.css	519 B
release/woocommerce-payments/dist/subscription-product-onboarding-modal.js	20.2 kB
release/woocommerce-payments/dist/subscription-product-onboarding-toast.js	693 B
release/woocommerce-payments/dist/subscriptions-empty-state-rtl.css	117 B
release/woocommerce-payments/dist/subscriptions-empty-state.css	117 B
release/woocommerce-payments/dist/subscriptions-empty-state.js	19.3 kB
release/woocommerce-payments/dist/tos-rtl.css	230 B
release/woocommerce-payments/dist/tos.css	231 B
release/woocommerce-payments/dist/tos.js	21.8 kB
release/woocommerce-payments/dist/upe_checkout-rtl.css	440 B
release/woocommerce-payments/dist/upe_checkout.css	441 B
release/woocommerce-payments/dist/upe_checkout.js	34 kB
release/woocommerce-payments/dist/upe_split_checkout-rtl.css	440 B
release/woocommerce-payments/dist/upe_split_checkout.css	441 B
release/woocommerce-payments/dist/upe_split_checkout.js	34.6 kB
release/woocommerce-payments/dist/upe_with_deferred_intent_creation_checkout.js	36.4 kB
release/woocommerce-payments/dist/upe-blocks-checkout-rtl.css	1.51 kB
release/woocommerce-payments/dist/upe-blocks-checkout.css	1.51 kB
release/woocommerce-payments/dist/upe-blocks-checkout.js	39.5 kB
release/woocommerce-payments/dist/upe-split-blocks-checkout-rtl.css	1.51 kB
release/woocommerce-payments/dist/upe-split-blocks-checkout.css	1.51 kB
release/woocommerce-payments/dist/upe-split-blocks-checkout.js	41.1 kB
release/woocommerce-payments/dist/woopay-express-button-rtl.css	146 B
release/woocommerce-payments/dist/woopay-express-button.css	146 B
release/woocommerce-payments/dist/woopay-express-button.js	50.5 kB
release/woocommerce-payments/dist/woopay-rtl.css	3.85 kB
release/woocommerce-payments/dist/woopay.css	3.85 kB
release/woocommerce-payments/dist/woopay.js	71.7 kB
release/woocommerce-payments/includes/subscriptions/assets/css/plugin-page.css	633 B
release/woocommerce-payments/includes/subscriptions/assets/js/plugin-page.js	720 B
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release/woocommerce-payments/vendor/automattic/jetpack-identity-crisis/build/index.js	13.8 kB
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release/woocommerce-payments/vendor/woocommerce/subscriptions-core/assets/css/about.css	1.2 kB
release/woocommerce-payments/vendor/woocommerce/subscriptions-core/assets/css/admin-order-statuses.css	403 B
release/woocommerce-payments/vendor/woocommerce/subscriptions-core/assets/css/admin.css	3.56 kB
release/woocommerce-payments/vendor/woocommerce/subscriptions-core/assets/css/checkout.css	299 B
release/woocommerce-payments/vendor/woocommerce/subscriptions-core/assets/css/modal.css	742 B
release/woocommerce-payments/vendor/woocommerce/subscriptions-core/assets/css/view-subscription.css	572 B
release/woocommerce-payments/vendor/woocommerce/subscriptions-core/assets/css/wcs-upgrade.css	411 B
release/woocommerce-payments/vendor/woocommerce/subscriptions-core/assets/js/admin/admin-pointers.js	544 B
release/woocommerce-payments/vendor/woocommerce/subscriptions-core/assets/js/admin/admin.js	9.55 kB
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release/woocommerce-payments/vendor/woocommerce/subscriptions-core/assets/js/frontend/wcs-cart.js	781 B
release/woocommerce-payments/vendor/woocommerce/subscriptions-core/assets/js/modal.js	1.1 kB
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release/woocommerce-payments/vendor/woocommerce/subscriptions-core/build/index.css	392 B
release/woocommerce-payments/vendor/woocommerce/subscriptions-core/build/index.js	3.06 kB

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[RadoslavGeorgiev]

LGTM

I'll implement the changes in the factors PR once this one is merged, to avoid rebasing.