Resolve "Hashed storage migration should not be attempted if project does not validate"

What does this MR do?

Skips Project validation for the Hashed Storage migration and rollback service classes:

• app/services/projects/hashed_storage/migrate_attachments_service.rb

• app/services/projects/hashed_storage/migrate_repository_service.rb

• app/services/projects/hashed_storage/rollback_attachments_service.rb

• app/services/projects/hashed_storage/rollback_repository_service.rb

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• 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 database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer

Closes #56618 (closed)