chore: onboarding google-cloud-location to Librarian

[suztomo]

Summary

• Onboard google-cloud-location to Librarian.
• Resolves ruby: custom file preservation in google-cloud-location and google-iam-v1 librarian#7462.

Custom File Preservation Verification

• README.md and .repo-metadata.json are preserved via the keep: list in librarian.yaml, replacing legacy OwlBot.prevent_overwrite_of_existing directives in .owlbot.rb. As the result, google-cloud-location/README.md is not touched by Librarian (this pull request).

Expected Changes during Onboarding

1. OwlBot Removal: Removed .owlbot.rb, .OwlBot.yaml, and .owlbot-manifest.json.
2. Library Metadata: Updated gem description/summary in google-cloud-location.gemspec, title in .yardopts, and header in proto_docs/README.md to reflect the service title from google/cloud/location/cloud.yaml (Cloud Metadata API).
3. Snippet Region Tags & File Permissions: Snippet sample tags updated to cloud_v0_generated_Locations_* matching the service title, and snippet permissions normalized from 755 to 644.
4. Copyright Year: Updated copyright year headers to 2026.

Local Verification

• toys ci --test --rubocop --doctest --yard --gems google-cloud-location: Passed (7 runs, 130 assertions, 0 failures, 0 errors, 0 RuboCop offenses, 0 YARD warnings).

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• google-cloud-location/snippets/locations/get_location.rb:19, tag cloud_v0_generated_Locations_GetLocation_sync
• google-cloud-location/snippets/locations/list_locations.rb:19, tag cloud_v0_generated_Locations_ListLocations_sync

You are about to delete 2 region tags.

• google-cloud-location/snippets/locations/get_location.rb:19, tag location_v0_generated_Locations_GetLocation_sync
• google-cloud-location/snippets/locations/list_locations.rb:19, tag location_v0_generated_Locations_ListLocations_sync

---

This comment is generated by snippet-bot.
If you find problems with this result, please file an issue at:
https://github.com/googleapis/repo-automation-bots/issues.
To update this comment, add snippet-bot:force-run label or use the checkbox below:

• Refresh this comment

[suztomo]

This is ready for review.