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Fully resolve tmpdir in verify-bazel.sh, since it might be a symlink on macOS

**What this PR does / why we need it**: Apparently the system tmpdir is inside a symlink on macOS, which confuses gazelle's symlink logic. By resolving this symlink to the absolute path, we can avoid the issue. 

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #61986

**Release note**:

```release-note
NONE
```

/assign @cblecker 
cc @patrikerdes