Prime caches to reduce DB queries

[leonidasmi]

Context

Includes two PRs:

• Prime caches when retrieving posts in the sitemaps #23348
• Warm caches when batch creating missing indexables #23355

Summary

This PR can be summarized in the following changelog entry:

• Merges the feature/performance-cache-improvements feature branch.

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 of the 2 included PRs.

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:

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.
• This PR also affects Yoast SEO for Google Docs. I have added a changelog entry starting with [yoast-doc-extension], added test instructions for Yoast SEO for Google Docs and attached the Google Docs Add-on 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.
• I have run grunt build:images and committed the results, if my PR introduces or edits images or SVGs.

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 #

[coveralls-official]

Coverage Report for CI Build 0

Coverage increased (+0.01%) to 55.288%

Details

• Coverage increased (+0.01%) from the base build.
• Patch coverage: 13 uncovered changes across 2 files (6 of 19 lines covered, 31.58%).
• 2 coverage regressions across 1 file.

Uncovered Changes

File	Changed	Covered	%
inc/sitemaps/class-sitemap-image-parser.php	9	1	11.11%
inc/sitemaps/class-post-type-sitemap-provider.php	5	0	0.0%
Total (3 files)	19	6	31.58%

Coverage Regressions

2 previously-covered lines in 1 file lost coverage.

File	Lines Losing Coverage	Coverage
inc/sitemaps/class-post-type-sitemap-provider.php	2	37.11%

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Coverage Stats

Relevant Lines:	72509
Covered Lines:	39967
Line Coverage:	55.12%
Relevant Branches:	18769
Covered Branches:	10499
Branch Coverage:	55.94%
Branches in Coverage %:	Yes
Coverage Strength:	41506.35 hits per line

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💛 - Coveralls