Cleanup monolith prompt for glab_ask_git_command

Alejandro Rodríguezrequested to merge
ask-git-aigw-cleanup into master

What does this MR do and why?

Cleanup monolith prompt for glab_ask_git_command

In #500896 (closed) we rolled out the prompt_migration_glab_ask_git_command Feature Flag, and as the last step we remove the old code and the flag itself, to consolidate the migration to the AI Gateway.

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