fix: onboarding vision libraries to Librarian

[suztomo]

See go/sdk-librarian-ruby-tracker

Summary

Onboards the remaining Cloud Vision versioned client gems to Librarian following the addition of toys_tasks support in Librarian v0.42.0 (googleapis/librarian#7513 / #36536):

• google-cloud-vision-v1
• google-cloud-vision-v1p3beta1
• google-cloud-vision-v1p4beta1

In librarian.yaml:

• Added toys (version: 0.22.0) under tools.gem.
• Configured ruby.toys_tasks: ["generate-helpers"] on each Vision library to run .toys/generate-helpers.rb post-generation.

Diff Analysis

1. OwlBot Removal: Deleted .owlbot.rb, .OwlBot.yaml, and .owlbot-manifest.json across all three libraries.
2. Library Metadata & Documentation:
   • gemspec description updated to match service.yaml (Integrates Google Vision features...).
   • Version title casing in README.md, .yardopts, and proto_docs/README.md normalized (V1p3beta1 -> V1P3BETA1, V1p4beta1 -> V1P4BETA1).
3. File Permissions: Snippet script permissions corrected from 100755 to 100644.
4. Generated Helper Methods: All custom Vision helper methods (helpers.rb, image_annotator_helpers_test.rb, helpers_smoke_test.rb) were cleanly generated via .toys/generate-helpers.rb with zero diff against the existing files.

Verification

Ran unit tests, RuboCop, and doctests locally:

toys ci --test --rubocop --doctest --gems google-cloud-vision-v1,google-cloud-vision-v1p3beta1,google-cloud-vision-v1p4beta1

All tests and RuboCop checks passed with 0 failures and 0 offenses.

[aandreassa]

Are we missing google-cloud-vision_ai-v1? Either way how you want to do it.

[suztomo]

For google-cloud-vision_ai-v1, it's a remaining issue googleapis/librarian#7505. Joe and I are trying to fix the source of the bad, unmatched quotations in google3.