[workflows] Update commit access request PR links

This PR updates the links used to show the PR contribution stats of the user
requesting commit access to the LLVM project. The link previously would only
show the PRs that were currently opened by the user because the
`/pulls/<username>` endpoint automatically applies the `is:open` filter.

The contribution guidelines suggest that the user should have at least 3 merged
PRs to be considered for commit access so this seems like a relavant data point
to add.

We now show all PRs that the user has created and a separate link for the PRs
that are merged.

Author: dmpots

llvm/utils/git/github-automation.py

@@ -297,9 +297,11 @@ def run(self) -> bool:
                 print(e)
                 continue
 
+        total_prs_url = f"https://github.com/llvm/llvm-project/pulls?q=author%3A{self.issue.user.login}+is%3Apr"
+        merged_prs_url = total_prs_url + "+is%3Amerged"
         comment = f"""
             ### Activity Summary:
-            * [{total_prs} Pull Requests](https://github.com/llvm/llvm-project/pulls/{self.issue.user.login}) ({merged_prs} merged)
+            * [{total_prs} Pull Requests]({total_prs_url}) ({merged_prs} [merged]({merged_prs_url}))
             * Top 3 Committers: {get_user_values_str(get_top_values(merged_by))}
             * Top 3 Reviewers: {get_user_values_str(get_top_values(reviewed_by))}
         """