chore: exclude trivial refactors from git blame results (#12550)

See https://docs.github.com/en/repositories/working-with-files/using-files/viewing-a-file#ignore-commits-in-the-blame-view

Ideally all style-only-commits should be put into this list.

The "move to typescript" is not trivial by itself, but most of the
additions / deletions are style changes. So I think it's safe and more
reader-friendly to exclude it.

Author: haoqunjiang

.git-blame-ignore-revs

@@ -0,0 +1,4 @@
+# chore: move to typescript
+af9fc2bcff31d5baa413039818a9b3e011deccaf
+# workflow: remove eslint, apply prettier
+72aed6a149b94b5b929fb47370a7a6d4cb7491c5