Protected containers: Rename column container_path_pattern

What does this MR do and why?

• This change was suggested by @10io and @jagood in !135969 (comment 1663923348)
• Renaming database column and model attribute container_path_pattern to repository_path_pattern to use consistent naming in the context of the container registry
• Following the guideline for renaming the column as described here: https://docs.gitlab.com/ee/development/database/avoiding_downtime_in_migrations.html#renaming-columns

🛠 with ❤ at Siemens

Screenshots or screen recordings

This MR contains only database -related changes

How to set up and validate locally

1. Run migration

rails db:migrate

2. Run test to verify that everything works as expected

bundle exec rspec spec/graphql/types/container_registry/protection/rule_type_spec.rb spec/models/container_registry/protection/rule_spec.rb spec/requests/api/graphql/mutations/container_registry/protection/rule/create_spec.rb spec/services/container_registry/protection/create_rule_service_spec.rb

Todos

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.
  • Changelog entry added, if necessary
  • Documentation created/updated via this MR
  • Documentation reviewed by technical writer or follow-up review issue created
  • Tests added for this feature/bug
  • Tested in all supported browsers
  • Conforms to the code review guidelines
  • Conforms to the merge request performance guidelines
  • Conforms to the style guides
  • Conforms to the javascript style guides
  • Conforms to the database guides

Related to #424367 (closed)