Use .venv dir for as Python venv and cache (#7485)

* Use .venv as Python venv dir

* Update refs to Python venv dir and use action to cache and setup

* Add missing shell: bash

* Source for Python deps

* Exclude .venv from lint

* Update ChangeLog

* Add cache-key arg for init-python

* Add missing "

* Use workflow specific Python cache names

* Fixed cache key for Linux

* Use bash if to make output clearer in case of skipping.

* Clearer debug output

* Add check for cache key

* Add missing shell

* Add SonarCloud and Valgrind venv cache

* Fixed typo

.github/workflows/lint-source-code.yml

@@ -20,10 +20,14 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Setup Python venv
+        uses: ./.github/actions/init-python
+        with:
+          cache-key: "lint-source-code"
+
       - name: Install dependencies
         run: |
-          python3 -m venv build/python
-          source build/python/bin/activate
+          source .venv/bin/activate
           pip install pyyaml cmake_format clang_format
 
       - name: Linting with CMake formatter