Support Editing Place Order button text in Checkout editor page.

[senadir]

Like #7012, The Place Order button doesn't support custom text directly, however, between all of them, this button is the most delicate because it is programmatically editable by a payment method, and we will make it editable via a filter.

Priority of text

Text should be shown with priority (first being the most important):

• The value returned by a filter (Matters if this issue Support dynamic place order button label #5876 is closed before working on this one).
• The value returned by a payment method.
• The value persisted by the merchant (this issue).
• The default value "Proceed to checkout" and i18n versions.

Expected outcome

• You should be able to select the button and edit the text with no styling options.
  A greater option would be to reuse the Button block or the button component or mimic that.

This should set the road to have full global styles support for that button, but that's a future goal.

A reminder to not fall into #7007 again is that we should mimic Button block and use RichText instead of PlainText.

Related issues

• Make mini cart buttons editable #7817
• Edit Proceed to Checkout button #7733

[github-actions]

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