Mark clang-tidy run as blame-exempt

This marks https://webrtc-review.googlesource.com/c/src/+/441061: Run tools_webrtc/apply-clang-tidy on the repo as skippable for "blame".

No-Try: True
Bug: None
Change-Id: I7312053e72d13064d919bd09f25990ce84bf7259
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/440944
Auto-Submit: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#46608}
diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
index 64849f9..d7d9f65 100644
--- a/.git-blame-ignore-revs
+++ b/.git-blame-ignore-revs
@@ -33,3 +33,4 @@
 # Format the rest
 7220ee97aafaa33a914f578e0f04184a94d17974
 # Run clang-tidy on the repo
+97b46e12582606a238d4f0c8524365cf5bdcb411