fix regex, remove deleted file from filter (#4942)

.pre-commit-config.yaml

         args: [--py3-plus, --py36-plus]
         exclude: >
             (?x)^(
-                .*barracuda.py|
                 .*_pb2.py|
                 .*_pb2_grpc.py
             )$
         args: [--assume-in-merge]
     -   id: check-yaml
         # Won't handle the templating in yamato
-        exclude: \.yamato/*
+        exclude: \.yamato/.*
 
 -   repo: https://github.com/pre-commit/pygrep-hooks
     rev: v1.4.2