Update CI workflow to use flake8, black, and isort formatting checks

.github/workflows/ci.yml

@@ -32,7 +32,15 @@ jobs:
 
     - name: Lint with flake8
       continue-on-error: false
-      run: flake8 autogpt/ tests/ --select E303,W293,W291,W292,E305,E231,E302
+      run: flake8
+
+    - name: Check black formatting
+      continue-on-error: false
+      run: black . --check
+
+    - name: Check isort formatting
+      continue-on-error: false
+      run: isort . --check
 
     - name: Run unittest tests with coverage
       run: |