fix: add wildcard to header checker bot config (GoogleCloudPlatform#5238)

* add header checker config

* add requirements files to ignore

* this is a test for header bot

* add wildcards to header checker config

* Add Google LLC to copyright holders

Author: leahecole

.github/header-checker-lint.yml

@@ -1,6 +1,6 @@
-{"allowedCopyrightHolders": [],
+{"allowedCopyrightHolders": ["Google LLC"],
  "allowedLicenses": ["Apache-2.0", "MIT", "BSD-3"],
- "ignoreFiles": ["requirements.txt", "requirements-test.txt"],
+ "ignoreFiles": ["**/requirements.txt", "**/requirements-test.txt"],
  "sourceFileExtensions": [
  	"ts", 
  	"js", 
@@ -12,4 +12,4 @@
  	"html",
  	"txt"
  ]
-}
+}