Move tests using captureExistenceFilterMismatches into the api_internal folder

Author: MarkDuckworth

packages/firestore/test/integration/api/pipeline.test.ts

@@ -33,7 +33,6 @@ import {
   DocumentData,
   Firestore,
   setDoc,
-  setLogLevel,
   collection,
   documentId as documentIdFieldPath,
   writeBatch,