test: add unit tests for retry.go in pkg/utils folder

[Prakhar-Shankar]

What this PR does / why we need it:

This PR adds unit tests for the retry package (retry.go) under the utils directory.
It improves test coverage by validating:

• Retry success and failure flows
• Timeouts
• Special case: breaking on "container is in terminated state"
• Nil action handling

It also modifies Try() to use .Error() == "..." instead of pointer comparison, making it more testable and idiomatic.

Which issue this PR fixes (optional, in fixes #<issue number> format):
Fixes #752
(Update once issue is created)

Special notes for your reviewer:

• All tests are table-driven and isolated
• 100% coverage for retry.go can be verified using go test -cover
• Let me know if you'd prefer a separate PR for the .Error() check improvement

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Checklist:

• Fixes Add unit tests for pkg/utils folder #752
• PR message has documentation-related information
• Labelled this PR & related issue with breaking-changes tag (Not applicable)
• PR message has breaking changes-related information (None)
• Labelled this PR & related issue with requires-upgrade tag (Not applicable)
• PR message has upgrade-related information (None)
• Commit has unit tests
• Commit has integration tests (Not needed)
• E2E run Required for the changes (Not needed)