Bug 1509526 [wpt PR 14208] - Revert "Find manifest for download by ta…

…gs instead of commits", a=testonly

Automatic update from web-platform-testsRevert "Find manifest for download by tags instead of commits"

Possible but unlikely cause of web-platform-tests/wpt#14207.

This reverts commit 3657828ff4243fcc2f3b3fa4e7bed34d646ad565.

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wpt-commits: 5438f72ea0bc2abb3754b2b906a34d497bd8457c
wpt-pr: 14208

UltraBlame original commit: 9caf650605472e0569cd50ab1d64bd557de4c163