WooCommerce Payments QIT tests

We currently only use the security tests from the QIT toolkit and these can be run locally.

Create local.env inside the tests/qit/config/ directory by copying the variables from default.env.
To get the actual values for local config, refer to this secret store link.
Once configured, the first time you run the npm command, it should create a local auth file which will be used for subsequent runs.
Currently, two types of tests are available through the npm command: Security and PHPStan tests. PHPStan tests can also be run against the local development build.

For running, use one of the following commands based on your requirements:

npm run test:qit-security
npm run test:qit-phpstan
npm run test:qit-phpstan-local

The commands use the build:release to create woocommerce-payments.zip at the root of the directory which is then uploaded and used for the QIT tests.

Once the test run is done, you'll see a result URL along with the test summary.
Look at any errors that might have been surfaced and associate with PRs that has introduced the same by using git blame.
Ping the author for fixing the error, or fix it yourself if it is straightforward enough.

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