Invalidate the Yoast SEO PHP files and directories instead of flushin…

[vraja-pro]

Reverted by #21082

Context

• We want to remove opcache reset.

Summary

This PR can be summarized in the following changelog entry:

• We want to remove op-cache reset.

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:

• Install Yoast test helper

• Clone op-cache gui to the public folder of your WordPress environment.

• Go to http://wordpress.test/opcache-gui/ (with your site).

• Enable real time update

• Search for wordpress-seo

• Check the results has no has been invalidated label.

• Search for yoast-test-helper

• Check the results are without has been invalidated label.

• Go to Tools->Yoast Test

• In section Plugin options & database versions change YoastSEO DB version to an older version

• Save

• Go to http://wordpress.test/opcache-gui/ (with your site).

• Go to the Cached tab and go to the last possible page.

• Scroll down and look for the has been invalidated label. as shown in the screenshot.
  

• Search for yoast-test-helper

• Check the results has no has been invalidated label.

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 (Block/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:

• QA can not test this PR directly.
• QA needs to perform regression tests for upgrading from previous versions.

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.

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 #20654

[thijsoo]

CR + ACC 👍