fix(codebuild): fails on using PR Events together with FILE_PATH filters in a FilterGroup (#9725)

Remove blocking validation on GitHub webhook file path filter when `event` is `PUSH` only.

Fixes #8867

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: JaseKirby

packages/@aws-cdk/aws-codebuild/lib/source.ts

@@ -407,9 +407,6 @@ export class FilterGroup {
   }
 
   private addFilePathFilter(pattern: string, include: boolean): FilterGroup {
-    if (this.actions.size !== 1 || !this.actions.has(EventAction.PUSH)) {
-      throw new Error('A file path condition cannot be added if a Group contains any event action other than PUSH');
-    }
     return this.addFilter(FILE_PATH_WEBHOOK_COND, pattern, include);
   }
 

packages/@aws-cdk/aws-codebuild/test/test.codebuild.ts

@@ -1631,13 +1631,11 @@ export = {
       test.done();
     },
 
-    'cannot have file path conditions if the Group contains any action other than PUSH'(test: Test) {
-      const filterGroup = codebuild.FilterGroup.inEventOf(codebuild.EventAction.PULL_REQUEST_CREATED,
-        codebuild.EventAction.PUSH);
-
-      test.throws(() => {
-        filterGroup.andFilePathIsNot('.*\\.java');
-      }, /A file path condition cannot be added if a Group contains any event action other than PUSH/);
+    'can have FILE_PATH filters if the Group contains PUSH and PR_CREATED events'(test: Test) {
+      codebuild.FilterGroup.inEventOf(
+        codebuild.EventAction.PULL_REQUEST_CREATED,
+        codebuild.EventAction.PUSH)
+        .andFilePathIsNot('.*\\.java');
 
       test.done();
     },