Revert notifying other admins of Yoast SEO

[leonidasmi]

Context

• Partly reverts Notify other admins of Yoast SEO #22644 because of a change in plans
• Partly because:
  • We don't show the new alert
  • We still store the user that installed Yoast SEO.

Summary

This PR can be summarized in the following changelog entry:

• Reverts notifying other admins of Yoast SEO.

Relevant technical choices:

Test instructions

Test instructions for the acceptance test before the PR gets merged

This PR can be acceptance tested by following these steps:

• Follow the test instructions for Notify other admins of Yoast SEO #22644 but confirm that you never see the new alert.
• Instead of seeing the new alert, confirm that in the DB, there's the first_activated_by option that always shows the ID of the user that activated the plugin (or 0 if it was installed via WP CLI)

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.

Impact check

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

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 #

[pls78]

CR && Acc: ✅

[coveralls]

Pull Request Test Coverage Report for Build 19a970a13fef7ba40bbb159d0746dc885fad816a

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.5%) to 52.78%

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Files with Coverage Reduction	New Missed Lines	%
src/alerts/application/ping-other-admins/ping-other-admins-alert.php	1	0.0%

Totals
Change from base Build 631b55e6a20fed8a15ef0bccfb634e30278ae758:	-0.5%
Covered Lines:	31468
Relevant Lines:	59786

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💛 - Coveralls