[ReferenceTarget] Re-enable test label-descendant.html
Fix and re-enable test label-descendant.html by
- include label in the test name to fix duplicated test names
- replace "Label" with "Input", which is the actual expected string.
- remove label-descendant-expected.txt
Bug: 369236539
Change-Id: I3e60363140a682d04d1b220ef663ff97514aeb40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6023845
Reviewed-by: Dan Clark daniec@microsoft.com
Commit-Queue: Alex Keng shihken@microsoft.com
Cr-Commit-Position: refs/heads/main@{#1383255}