Migrate away from deprecated ioutil

[sebrandon1]

ioutil has been deprecated since Go 1.16: https://go.dev/doc/go1.16#ioutil

Tracking issue: redhat-best-practices-for-k8s/telco-bot#52

[coderabbitai]

Walkthrough

Replaces use of the deprecated io/ioutil.Discard with io.Discard in a Go test file and updates the import accordingly. No behavioral or API changes beyond using the current standard library symbol.

Changes

Cohort / File(s)	Summary
Deprecation Update velero-plugins/util/test/test_logger.go	Replace io/ioutil import with io and set logger.Out from ioutil.Discard to io.Discard.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

✨ Finishing touches

• 📝 Generate docstrings

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📥 Commits

Reviewing files that changed from the base of the PR and between 19005ee and 7a31fab.

📒 Files selected for processing (1)

• velero-plugins/util/test/test_logger.go

🚧 Files skipped from review as they are similar to previous changes (1)

• velero-plugins/util/test/test_logger.go

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This pull-request has been approved by: kaovilai, sebrandon1

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