Add instrumentation for RewriteHistory Gitaly RPC (redact text)

What does this MR do and why?

Adds instrumentation for the RewriteHistory Gitaly RPC (redact text) feature

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

How to set up and validate locally

1. Enable the rewrite_history_ui feature flag.
2. Navigate to Project > Setting > Repository > Repository maintenance
3. Click on Redact text
4. The redact text drawer should open
5. Add text to the textarea
6. Confirm
7. The click_redact_text_button_repository_settings event should be published

Related to #461887