A11y: Use DOM element for booking form title.

[peterwilsoncc]

All Submissions:

• Does your code follow the WooCommerce Sniffs variant of WordPress coding standards?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?
• Will this change require new documentation or changes to existing documentation?

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Changes proposed in this Pull Request:

See https://linear.app/a8c/issue/WOOACBK-70/a11y-fix-issues-with-booking-form-on-product-page
Related https://github.com/woocommerce/woocommerce-bookings/pull/4098

Steps to test the changes in this Pull Request:

Warning

This pull request makes some significant changes to the Bookings form used on the front end of the sites. All purchasing related critical flows will need to be tested for both this plugin and the Accommodations Bookings plugin.

To ensure backward and forward compatibility the following combinations will need to be tested:

• This feature branch with Bookings trunk
• This feature branch with Bookings https://github.com/woocommerce/woocommerce-bookings/pull/4098
• Accommodation trunk with Bookings https://github.com/woocommerce/woocommerce-bookings/pull/4098

Changelog entry

Add - Enter a summary of all changes on this Pull Request. This will appear in the changelog if accepted.

Closes #549

[github-actions]

This is linked to GitHub issue #549.