Remove CQ for unsupported branch chrome/m105

Change-Id: I3b9188d7011e5f3496fd5c572cd2ba202e806178
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/603823
Reviewed-by: Rakshit Sharma <sharaks@google.com>
Reviewed-by: Heather Miller <hcm@google.com>
Reviewed-by: Eric Boren <borenet@google.com>