Implementation: Generate a commit SHA-specific chain of custody report [Frontend]

Problem to solve

This is the frontend implementation issue for Generate a commit SHA-specific chain of custody report &4608 (closed).

User experience goal

An administrator or group owner input a specific commimt SHA into a chain of custody download prompt and receive a CSV report in the same format, but which shows the MR, pipeline, author, approver, etc for that specific commit SHA.

Intended users

• Cameron (Compliance Manager)
• Delaney (Development Team Lead)
• Sasha (Software Developer)
• Sidney (Systems Administrator)
• Rachel (Release Manager)

Proposal

Update the chain of custody report to filter the criteria to show only data points related to the specific commit SHA provided by a user.

1. An admin or group owner clicks on the export button and sees a prompt
2. Their options could be: [List of all merge requests] or [ Search Commit SHA]
3. Using the second option, they input 1a2bc3 to find a commit sha report
4. They receive the same report as we've built in #213364 (closed), but it would show only data related to the specific commit SHA

Empty State	Error	Long hash

Implementation

1. Change the List all merge commits button to a button with dropdown with the new input form.
2. On input done, check if the hash is valid with a simple regular expression.
3. On export click, submit the commit hash to the mergeCommitsCsvExportPath.