fix(test): fix unit tests in pkg capture

[alexcastilio]

Description

Unit tests for this pkg were failing. E.g. https://github.com/microsoft/retina/actions/runs/15751219397/job/44396605626

This PR fixes problems in pkg.

Related Issue

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Checklist

• I have read the contributing documentation.
• I signed and signed-off the commits (git commit -S -s ...). See this documentation on signing commits.
• I have correctly attributed the author(s) of the code.
• I have tested the changes locally.
• I have followed the project's style guidelines.
• I have updated the documentation, if necessary.
• I have added tests, if applicable.

Screenshots (if applicable) or Testing Completed

Unit test for pkg:

$ go test ./pkg/capture/...
ok      github.com/microsoft/retina/pkg/capture 0.505s
?       github.com/microsoft/retina/pkg/capture/constants       [no test files]
?       github.com/microsoft/retina/pkg/capture/file    [no test files]
ok      github.com/microsoft/retina/pkg/capture/outputlocation  0.007s
?       github.com/microsoft/retina/pkg/capture/outputlocation/managed  [no test files]
ok      github.com/microsoft/retina/pkg/capture/provider        0.006s
ok      github.com/microsoft/retina/pkg/capture/utils   0.009s

Additional Notes

Add any additional notes or context about the pull request here.

---

Please refer to the CONTRIBUTING.md file for more information on how to contribute to this project.

[kamilprz]

make test results