chore: add new helper labels (#15138)

Co-authored-by: Rhys Arkins <rhys@arkins.net>
Co-authored-by: Jamie Magee <jamie.magee@gmail.com>
Co-authored-by: HonkingGoose <34918129+HonkingGoose@users.noreply.github.com>

.github/label-actions.yml

@@ -125,4 +125,43 @@
     Good luck,
 
 
+    The Renovate team
+
+'pr:no-coverage-ignore':
+  comment: >
+    Hi there,
+
+
+    You're skipping code tests with `istanbul ignore`.
+    Please only skip tests if:
+      - you cannot test the code, or
+      - the code is very difficult to test, or
+      - the edge case won't usually happen at runtime
+    If you skip a test then always comment why:
+    ```ts
+    // istanbul ignore next: typescript strict null check
+    if (!url) {
+      return null;
+    }
+    ```
+
+
+    Good luck,
+
+
+    The Renovate team
+
+'pr:no-done-comments':
+  comment: >
+    Hi there,
+
+
+    You are using simple `done` comments which cause a lot of noise.
+    Instead, please use GitHub's web interface to request another review.
+    Please read our [contribution guide](https://github.com/renovatebot/renovate/blob/main/.github/contributing.md#resolve-review-comments-instead-of-commenting) to reduce noise.
+
+
+    Good luck,
+
+
     The Renovate team