Jonathan Desrosiers 85f99cf214 Build/Test Tools: Backport GitHub Action and build improvements to the 5.0 branch.
This backports several build and test tool improvements to the 5.0 branch. Most notably, this includes:

- The changes required to allow each workflow to be triggered by the `workflow_dispatch` event so that tests can be run on a schedule [50590].
- Splitting single site and multisite tests into parallel jobs [50379].
- Split slow tests into separate, parallel jobs for PHP <= 5.6 [50444].
- Better branch and path scoping for GitHub Action workflows when running on `pull_request` [50432,50479].
- Several `devDependency` updates.

Merges [45317,50267,50379,50387,50413,50416,50432,50435-50436,50444,50446,50473-50474,50476,50479,50485-50487,50545,50579,50590,50598] to the 5.0 branch.
See #50401, #51801, #51802, #52548, #52608, #52612, #52624, #52625, #52645, #52653, #52658, #52660, #52667.

git-svn-id: https://develop.svn.wordpress.org/branches/5.0@50624 602fd350-edb4-49c9-b593-d223f7449a82
2021-03-31 19:26:39 +00:00
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