Simplified YAML files for Github Actions workflows

Updated actions where needed

.github/workflows/linux_unit_tests.yaml

@@ -19,8 +19,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Setup Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+    - uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install System packages
@@ -56,8 +55,7 @@ jobs:
           share/spack/qa/run-unit-tests
           coverage combine
           coverage xml
-    - name: Upload to codecov.io
-      uses: codecov/codecov-action@v1
+    - uses: codecov/codecov-action@v1
       with:
         flags: unittests,linux
   shell:
@@ -98,7 +96,6 @@ jobs:
           COVERAGE: true
       run: |
           share/spack/qa/run-shell-tests
-    - name: Upload to codecov.io
-      uses: codecov/codecov-action@v1
+    - uses: codecov/codecov-action@v1
       with:
         flags: shelltests,linux