Refactor version_translator_spec.rb

What does this MR do?

This patch refactors the version_translator_spec.rb test suite to improve readability and maintainability. It introduces a shared example group for version translator tests, streamlining the test structure.

What are the relevant issue numbers?

• Refactor semver_dialects tests (gitlab-org/gitlab#441450 - closed) • Philip Cunningham • 16.10
• Composition Analysis - Reaction Rotation for 16.10 (gitlab-org/secure/general#297 - closed) • Philip Cunningham, Nick Ilieskou • 16.10

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for this project, if necessary
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Security reports checked/validated by reviewer