Process Taxonomy type before CPT

[radeno]

Context

• Title rewritings

Summary

This fixes https://github.com/Yoast/wordpress-seo/issues/9539

Taxonomy can be assigned to multiple post types. This allows to use CPT variables like %%pt_singular%% and %%pt_plural%% in taxonomy rewritings. This was able to last in version 13. Sadly it is not able to change by any filter.

This PR can be summarized in the following changelog entry:

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:

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:

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

• [x] I have tested this code to the best of my abilities
• [ ] 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.

Fixes # https://github.com/Yoast/wordpress-seo/issues/9539

[leonidasmi]

Thank you for the contribution @radeno.

Could you share some step-by-step Test Instructions so we can dive into this thoroughly?

[radeno]

Here we go. @leonidasmi

Test case

1. create new CPT
2. create new TAX
3. link them together: 'taxonomies' => [$CPT_NAME], and register_taxonomy($TAX_NAME, $CPT_NAME, $args);
4. define new rewrite rule as: $CTP_NAME / $TAX_NAME
5. define SEO Title for TAX as %%pt_plural%% %%sep%% %%term_title%%

Before change: No CPT plural name in the final Title After change: CPT plural name provided in the final Title

More in my comment with two screenshots provided https://github.com/Yoast/wordpress-seo/issues/9539#issuecomment-731742523