[COT] Implement order bulk actions

[jorgeatorres]

Changes proposed in this Pull Request:

This PR implements order bulk actions for the new implementation of the orders list table for COT (#32864).

• The PR introduces class Internal\Admin\Orders\PageController to handle registration of the "Orders" menu item and initialization of all things associated to it. For example, it takes care of figuring out which order screen to display, which might be useful for Render order edit page  #33638 (which implements the "edit order" screen and logic).
• Bulk actions are implemented inside the list table directly, in line with the current CPT implementation, but similar to other TODO's in this file, we might want to move it outside of the table implementation (maybe an "OrderPage" class that the "PageController" manages?).
• Row-level actions (i.e. not bulk actions) do not require changes to the codebase, as those are handled by an AJAX handler that is datastore & list table implementation agnostic.

Closes #33198.

How to test the changes in this Pull Request:

As there's nothing COT datastore specific in this PR, it should be possible to test by "tricking" the code as described in #

1. Get the new list table showing.

   • As there's nothing COT datastore specific in this PR, it should be possible to do this by tricking WC into displaying the new table as described in Admin list table [COT] #32864:

     I temporarily tweaked this line of code by adding true || to the start of the condition, to make the new admin list table render anyway.

   • For the full COT-datastore experience, make sure to enable the feature and migrate some orders over to the new tables. Set COT as authoritative and use a snippet like this one to "mock" a query() method implementation.

2. Use either the top or bottom bulk actions drop-down to apply different statuses to your orders.
3. Make sure the actions work correctly, including the redirect and admin notices:
   

[botwoo]

📊 Test reports for this pull request have been published and are accessible through the following links:

• REST API Test Report
• E2E Test Report (TBC)

Latest commit referenced in the reports: Add changelog e5c19a0
This comment will automatically be updated with the latest referenced commit when you push new changes to this pull request.

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[barryhughes]

This is great. I added some notes but mostly minor/optional stuff: works really well, thanks!

[github-actions]

Hi @barryhughes, thanks for merging this pull request. Please take a look at these follow-up tasks you may need to perform:

• Add the release: add testing instructions label