Feature/re organize ai code

[pls78]

Context

• We want to tidy up the AI-related code.
• ⚠️ Adapt the Yoast SEO version number in the deprecation docblocks and _deprecated_function according to the release this PR will be part of.

Summary

This PR can be summarized in the following changelog entry:

• Re-organizes AI-related code by collecting all modules into an ai parent directory and consequently losing the AI_ namespace/class prefix
• Exposes the REST endpoints in the window object.

Relevant technical choices:

• All the AI-related modules dropped the AI_ prefix and are now under an ai parent directory.
• Endpoint_List and Endpoints_Repository classes have been moved to src/routes/endpoint directory, so that they can be re-used throughout the codebase and not being re-declared each time.
• Consent_Endpoint_Interface, Free_Sparks_Endpoint_Interface, Generator_Endpoint_Interface have been introduced to let our DI container know which endpoints need to be gathered by the respective repository. As a result, they are attached to the respective integration window object in the endpoint property (exception made for the Free Sparks one, which is bundled in thewpseoAiGenerator window object.
• This means we can now fetch routes URLs from the backend, avoiding hard-coding it in JavaScript ( like we already do in the Dashboard)

Test instructions

Test instructions for the acceptance test before the PR gets merged

This PR can be acceptance tested by following these steps:

• Regression-test all the AI-related features in the following cases
  • Only Free (this PR/RC) installed -> test the free version of the AI Generate feature
  • Free + Premium both up-to-date (This PR/RC + corresponding Premium PR/RC)
  • Up-to-date Free and old version of Premium

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:

• N/A

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 Make deprecated AI-related classes usable by Premium

[coveralls]

Pull Request Test Coverage Report for Build 947a0514c8ae6e99811eb0fc52c9b5725363aedd

Details

• 671 of 732 (91.67%) changed or added relevant lines in 41 files are covered.
• No unchanged relevant lines lost coverage.
• Overall first build on feature/re-organize-ai-code at 49.452%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/ai/http-request/domain/exceptions/wp-request-exception.php	0	2	0.0%
src/ai/consent/application/consent-endpoints-repository.php	0	3	0.0%
src/ai/free-sparks/application/free-sparks-endpoints-repository.php	0	3	0.0%
src/ai/generate/application/generator-endpoints-repository.php	0	3	0.0%
src/routes/endpoint/endpoint-list.php	0	4	0.0%
src/ai/http-request/domain/exceptions/payment-required-exception.php	0	5	0.0%
src/ai/http-request/domain/exceptions/remote-request-exception.php	0	5	0.0%
src/routes/endpoint/endpoints-repository.php	0	7	0.0%
src/ai/http-request/domain/request.php	0	13	0.0%
src/ai/http-request/domain/response.php	0	16	0.0%

Totals
Change from base Build 44608024e022368daba1a3d1fdd2be87e0e4c75f:	49.5%
Covered Lines:	17323
Relevant Lines:	35030

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💛 - Coveralls