[llvm] github-automation: Use a single comment for team mentions on pull req… (PR #66037)

[Mehdi Amini via llvm-commits]

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@@ -9,6 +9,14 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  # Ideally, we would use the PR number in the concurrency group, but we don't
+  # have access to it here.  We need to ensure only one job is running for
+  # each PR at a time, because there is a potentaill race condition when
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joker-eph wrote:

```suggestion
  # each PR at a time, because there is a potential race condition when
```

https://github.com/llvm/llvm-project/pull/66037