[workflows] Update commit access request PR links (llvm#146169)

This PR updates the links used to show the PR contribution stats of the
user requesting commit access to the LLVM project. Previously we 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
relevant data point to add.

We now show all PRs that a user has created (not just the open ones) and
a separate link for the PRs that are merged.

Author: dmpots

llvm/utils/git/github-automation.py

@@ -297,9 +297,12 @@ 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 Pull Requests]({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))}
         """