release-26.2: backup: TestBackupCompactionLocAware failed

backup.TestBackupCompactionLocAware [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Ci_TestsAwsLinuxArm64_UnitTests/21441424?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Ci_TestsAwsLinuxArm64_UnitTests/21441424?buildTab=artifacts#/) on release-26.2 @ [4f472fe3968bebd2d70a4cd5dbc68063e579357c](https://github.com/cockroachdb/cockroach/commits/4f472fe3968bebd2d70a4cd5dbc68063e579357c):

```
=== RUN TestBackupCompactionLocAware
test_log_scope.go:172: test logs captured to: /artifacts/tmp/_tmp/21cc72362c3f7e9ee045b49469db99ef/logTestBackupCompactionLocAware1031134644
test_log_scope.go:82: use -show-logs to present logs inline
test_server_shim.go:95: cluster virtualization disabled due to issue: #142798 (expected label: C-test-failure)
test_server_shim.go:638: DRPC is enabled (via testserver factory defaults)
testutils.go:368: no Invalid Descriptors
compaction_test.go:1277: -- test log scope end --
test logs left over in: /artifacts/tmp/_tmp/21cc72362c3f7e9ee045b49469db99ef/logTestBackupCompactionLocAware1031134644
--- FAIL: TestBackupCompactionLocAware (86.12s)
=== RUN TestBackupCompactionLocAware/fully-matching
jobs_verification.go:94: job failed: expected manifest /incrementals/2026/07/27-193746.12/20260727/193747.41-20260727-193746.99/BACKUP_PART_2_dc=dc1 not found in backup locations
--- FAIL: TestBackupCompactionLocAware/fully-matching (22.28s)
```
Help

See also: [How To Investigate a Go Test Failure \(internal\)](https://cockroachlabs.atlassian.net/l/c/HgfXfJgM)

/cc @cockroachlabs/disaster-recovery

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Jira issue: CRDB-66133