21610 deprecate and remove jetpack boost ad code

[vraja-pro]

Context

• Revome jetpack boost ad and integration card.

Summary

This PR can be summarized in the following changelog entry:

• Remove unreleased jetpack ad code.

Relevant technical choices:

• I did not deprecated the classes since those ads were never released and are meant for internal use.

Test instructions

Test instructions for the acceptance test before the PR gets merged

This PR can be acceptance tested by following these steps:

These are more regression tests:

• Go to integration page and check there are no console errors.
• Edit a post in the block editor and check you get no console errors.
• install Jetpack boost and repeat those steps.

Relevant test scenarios

• Changes should be tested with the browser console open
• Changes should be tested on different posts/pages/taxonomies/custom post types/custom taxonomies
• Changes should be tested on different editors (Default Block/Gutenberg/Classic/Elementor/other)
• Changes should be tested on different browsers
• Changes should be tested on multisite

Test instructions for QA when the code is in the RC

• QA should use the same steps as above.

QA can test this PR by following these steps:

Impact check

This PR affects the following parts of the plugin, which may require extra testing:

UI changes

• This PR changes the UI in the plugin. I have added the 'UI change' label to this PR.

Other environments

• This PR also affects Shopify. I have added a changelog entry starting with [shopify-seo], added test instructions for Shopify and attached the Shopify label to this PR.

Documentation

• I have written documentation for this change. For example, comments in the Relevant technical choices, comments in the code, documentation on Confluence / shared Google Drive / Yoast developer portal, or other.

Quality assurance

• I have tested this code to the best of my abilities.
• During testing, I had activated all plugins that Yoast SEO provides integrations for.
• I have added unit tests to verify the code works as intended.
• If any part of the code is behind a feature flag, my test instructions also cover cases where the feature flag is switched off.
• I have written this PR in accordance with my team's definition of done.
• I have checked that the base branch is correctly set.

Innovation

• No innovation project is applicable for this PR.
• This PR falls under an innovation project. I have attached the innovation label.
• I have added my hours to the WBSO document.

Fixes #21610

[igorschoester]

CR && AT ✅

[coveralls]

Pull Request Test Coverage Report for Build 0aab1fa4eb16e5b29a333db0fcfcc179f1f72cc2

Details

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+5.2%) to 54.717%

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Totals
Change from base Build 6fc322255e9fa38f96f1a322033c1f32e66e1c1d:	5.2%
Covered Lines:	29746
Relevant Lines:	54609

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💛 - Coveralls