Jonathan Desrosiers 563a4c3e08 Build/Test Tools: Simplify Composer package caching.
This simplifies the caching of Composer dependencies in the coding standards and PHP compatibility workflows by using a published action. This combines 3 steps into 1 within these workflows.

Because the Composer implementation within the PHPUnit test workflow is a bit specialized (`composer install` is run within the Docker container), caching has been left as is in that workflow. However, the cache key has been changed to include the version of PHP being tested. This will prevent incorrect versions of dependencies being present when they are required on jobs other than PHP 8.

Props jrf.
See #50401.

git-svn-id: https://develop.svn.wordpress.org/trunk@49938 602fd350-edb4-49c9-b593-d223f7449a82
2021-01-05 19:21:50 +00:00
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