Update files when snippet is updated

What does this MR do?

When a snippet is updated we have to update the repository content as well. In this MR, we add the necessary actions to update the file path or content in the repository.

Refs #39265 (closed) and #199221 (closed)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [ ] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content