Show missing git fields instead of a generic message

[tanishq-dubey]

What and why?

STAL-3069

• If all required git tags are not in our analysis, we returned a generic failure message on payload upload. This made debugging difficult for users. We are now returning the specific git tags that are missing to make debugging easier.

How?

This change adds a new error message renderer for missing git fields, and changes the tag requirement logic to share it between the error renderer and the generatePayload check

Review checklist

• Feature or bugfix MUST have appropriate tests (unit, integration)