build(java): remove codecov action (#1078)

Author: chingor13

synthtool/gcp/templates/java_library/.github/workflows/ci.yaml

@@ -19,10 +19,6 @@ jobs:
     - run: .kokoro/build.sh
       env:
         JOB_TYPE: test
-    - name: coverage
-      uses: codecov/codecov-action@v1
-      with:
-        name: actions ${{'{{matrix.java}}'}}
   windows:
     runs-on: windows-latest
     steps:
@@ -80,4 +76,4 @@ jobs:
     - run: java -version
     - run: .kokoro/build.sh
       env:
-        JOB_TYPE: clirr
+        JOB_TYPE: clirr