John Blackbourn ef09cd88de Build/Test Tools: Add assertions to ensure version-controlled files are not modified during CI, and fix the grunt clean command.
Some tests and some commands that run during the build steps modify files that are under version control. This adds assertions to ensure that these files don't remain in a modified state after the test runs on CI.

This also fixes the `grunt clean` command which erroneously deletes `script-loader-packages.php`. This file is re-populated during the build, but deleting it during the clean is undesirable.

Fixes #53606


git-svn-id: https://develop.svn.wordpress.org/trunk@51355 602fd350-edb4-49c9-b593-d223f7449a82
2021-07-06 18:36:46 +00:00
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