[infra] Filter PathKit and CanvasKit tryjobs when cutting Chrome branch

The Chrome branches are irrelevent to CanvasKit/PathKit.

We only officially build/support *Kit built from ToT

Change-Id: I5f04ead23bb5d76891aec71350bad5b3039c2eda
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/351919
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Eric Boren <borenet@google.com>

tools/chrome_release_branch.py

@@ -84,6 +84,8 @@ def update_infra_config(old_branch, new_branch):
                          '--exclude-trybots=chromium.*',
                          '--exclude-trybots=.*Android_Framework.*',
                          '--exclude-trybots=.*G3_Framework.*',
+                         '--exclude-trybots=.*CanvasKit.*',
+                         '--exclude-trybots=.*PathKit.*',
                          '--submit'])