fix: correct submit button text on change-payment-method page

[jason10lee]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

The "Change Payment" modal on the My Account subscription page shows "Place order" as its submit button text. This fixes it to read "Update payment method", matching the label used elsewhere in the My Account payment flow.

Closes NPPM-2655.

How to test the changes in this Pull Request:

1. Set up a site with WooCommerce Subscriptions and a payment gateway that supports the change-payment-method flow (e.g., Braintree or Stripe).
2. Create or locate an active subscription for a test user.
3. Log in as that user and navigate to My Account → Subscriptions.
4. Click the three-dot menu on a subscription and select "Update payment method".
5. Verify the submit button in the modal reads "Update payment method" (not "Place order").
6. Navigate to a normal checkout page (e.g., add a product to cart and proceed to checkout).
7. Verify the checkout button still displays its expected text ("Place order", "Donate now", or "Change subscription" depending on cart contents).

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[Copilot]

Pull request overview

Fixes the submit button label shown in the WooCommerce Subscriptions “change payment method” modal checkout flow so it no longer displays the generic checkout text (“Place order”), and instead matches the rest of the My Account payment update UI.

Changes:

• Hooks woocommerce_order_button_text within the My Account customizations to override the checkout submit label for the change-payment-method flow.
• Adds a small helper method that returns “Update payment method” when the request is identified as the payment-method-change checkout.

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