This backports several build and test tool improvements to the 5.1 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 5.1 branch.
See #50401, #51801, #51802, #52548, #52608, #52612, #52624, #52625, #52645, #52653, #52658, #52660, #52667.
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This updates the 5.1 branch to support the latest LTS version of NodeJS (currently 14.x), allowing the same version to be used across all WordPress branches that receive security updates as a courtesy.
In addition to backporting the package updates that happened after branching 5.1, dependencies that were removed in future releases have also been updated to their latest versions.
Props desrosj, dd32, netweb, jorbin.
Merges [44233,44728,45321,45765,45826,46403-46404,46408-46409,47404,47867-47869,47872-47873,48705,49636,49933,49937,49939,49940,49983,49989,50017,50126,50176,50185] to the 5.1 branch.
See #52341.
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