Workflow changes (#11692)

Modifying workflows to install python for make commands
Squashing CI tasks to remove repeated steps
Modifying pre-commit.sh to not fail if there are no python file changes

.github/workflows/e2e_test.yml

@@ -18,6 +18,14 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
+      - name: Get python version from Makefile
+        run: echo py_version=`make PYTHON_VERSION` >> $GITHUB_ENV
+
+      - name: Install python ${{ env.py_version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ env.py_version }}
+
       - name: Install system deps
         run: sudo apt-get install -y gettext