Cleanup - unused imports, Files.readString/writeString

[rsvoboda]

• Removal of unused imports
• Use Files.writeString and Files.readString where possible

[quarkus-bot]

/cc @brunobat (micrometer), @ebullient (micrometer), @gsmet (hibernate-orm,hibernate-search), @marko-bekhta (hibernate-search)

[rsvoboda]

Native Tests - Security2 ... Error: The operation was canceled.

Not sure what happened

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 796712f.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

You can consult the Develocity build scans.

[gastaldi]

Better if we backport this to avoid potential merge conflicts on future PRs?