Do not lock the artifact-dir for check builds + fix uplifting #16307
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What does this PR try to resolve?
This PR un-reverts the changes from #16230 as well as adds a bug fix for a crash reported in #16297
Note: The bug fix relies on behavior in the reverted code, so I added that back before the bug fix
How to test and review this PR?
I added a new check test that verifies the existing behavior (crash) and is updated to verify no files are added to the target dir with no crash.
r? @epage
cc: @stewartadam (thanks, again for the bug report)
Fixes #16305