chore(java): remove formatter action

Source-Author: Jeff Ching <chingor@google.com>
Source-Date: Tue Dec 29 10:50:17 2020 -0800
Source-Repo: googleapis/synthtool
Source-Sha: 6133907dbb3ddab204a17a15d5c53ec0aae9b033
Source-Link: googleapis/synthtool@6133907

Author: yoshi-automation

.github/workflows/formatting.yaml

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-document-ai.git",
-        "sha": "8eae6693b33cfaec666a4a10720e0e7e298b937e"
+        "sha": "0c0432eb1afe922461c838eb26c79b617bf5e518"
       }
     },
     {
@@ -35,7 +35,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "3f67ceece7e797a5736a25488aae35405649b90b"
+        "sha": "6133907dbb3ddab204a17a15d5c53ec0aae9b033"
       }
     }
   ],
@@ -83,7 +83,6 @@
     ".github/workflows/approve-readme.yaml",
     ".github/workflows/auto-release.yaml",
     ".github/workflows/ci.yaml",
-    ".github/workflows/formatting.yaml",
     ".github/workflows/samples.yaml",
     ".kokoro/build.bat",
     ".kokoro/build.sh",