Fix nil pointer dereference in sortUnpackJobs when sorting non-failed jobs

[jianzhangbjz]

Description of the change:
Added a nil check before accessing LastTransitionTime. When both conditions are nil (i.e., both jobs have not failed), fall back to sorting by CreationTimestamp instead.

• pkg/controller/bundle/bundle_unpacker.go: Added nil check for condI and condJ in the sort comparison function

Motivation for the change:
The catalog-operator crashes with a nil pointer dereference panic when sorting unpack jobs:

  panic: runtime error: invalid memory address or nil pointer dereference
  [signal SIGSEGV: segmentation violation code=0x1 addr=0x38 pc=0x1f94bf0]

  goroutine 514 [running]:
  github.com/operator-framework/operator-lifecycle-manager/pkg/controller/bundle.sortUnpackJobs.func1(...)
      /pkg/controller/bundle/bundle_unpacker.go:889 +0x1f0

In sortUnpackJobs(), when comparing two jobs that both have not failed (failedI == false && failedJ == false), the getCondition() function returns nil for both condI and condJ. The code then attempts to access condI.LastTransitionTime without a nil check, causing the panic.
More details: https://issues.redhat.com/browse/OCPBUGS-77179

Architectural changes:

Testing remarks:

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Bug fixes are accompanied by regression test(s)
• e2e tests and flake fixes are accompanied evidence of flake testing, e.g. executing the test 100(0) times
• tech debt/todo is accompanied by issue link(s) in comments in the surrounding code
• Tests are comprehensible, e.g. Ginkgo DSL is being used appropriately
• Docs updated or added to /doc
• Commit messages sensible and descriptive
• Tests marked as [FLAKE] are truly flaky and have an issue
• Code is properly formatted

Assisted-By: Claude-Code

[tmshort]

/approve

[openshift-ci]

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