fix(backup): apply configured podSecurityContext to backup CronJob

[snecklifter]

Summary

• Apply podSecurityContext from DevWorkspaceOperatorConfig to backup Job pod template
• Consistent with how workspace deployments and PVC cleanup jobs apply the same config field
• When podSecurityContext is not configured (nil), behavior is unchanged from current

Fixes #1636

Test plan

• Unit test verifies backup Job uses configured podSecurityContext (custom FSGroupChangePolicy and SELinuxOptions)
• Unit test verifies podSecurityContext is nil when not configured
• All existing backup controller tests pass (go test ./controllers/backupcronjob/...)
• go vet clean

Assisted-by: Claude Code

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: snecklifter
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📥 Commits

Reviewing files that changed from the base of the PR and between cdc8050 and 5280032.

📒 Files selected for processing (2)

• controllers/backupcronjob/backupcronjob_controller.go
• controllers/backupcronjob/backupcronjob_controller_test.go

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[openshift-ci]

Hi @snecklifter. Thanks for your PR.

I'm waiting for a devfile member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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