[7.2.0] Only check for shard status file if a test passed #22143
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If a test fails, the failure is going to be informative than a generic exec error and the failure may have interrupted or prevented the test runner from touching the status file.
Speculatively fixes #22028
Closes #22098.
PiperOrigin-RevId: 628355694
Change-Id: I370c7aba331f2a7a89cb9a9ff99d32b1694fd03a
Commit 874a050