Add release process task for update moodle-plugin-ci test matrix and templates.

[kabalin]

Adding checklist item to remember about bumping moodle-plugin-ci test matrix (as discussed with @junpataleta)

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🔴 45	🟢 95	🟢 100	🟢 90	🟢 100	Report
/docs/4.4/apis/commonfiles	🔴 43	🟢 93	🟢 100	🟢 100	🟢 100	Report
/general/development/gettingstarted	🟠 58	🟢 95	🟢 100	🟢 90	🟢 100	Report
/general/releases	🟠 64	🟢 95	🟢 100	🟢 100	🟢 100	Report

[junpataleta]

I'm not sure if we need to perform this task for the minor release cycle as well, so I'd like to ask for some clarification and pros/cons of doing it during minor releases as well instead of only major releases.

[junpataleta]

Thanks! Looks good to go now!