ci: standardize venv setup with --skip-requirements and explicit test dependencies across workflows

- Added --skip-requirements flag to cli-level1-tests.yml, python-tests.yml, and staking-tests.yml
- Specified explicit test package dependencies via --extra-packages instead of relying on requirements files
  - cli-level1-tests.yml: pytest click typer rich
  - python-tests.yml: pytest pytest-cov pytest-mock pytest-timeout pytest-asyncio locust
  - staking-tests.yml: pytest pytest-asyncio
- Increased

.gitea/workflows/python-tests.yml

@@ -45,8 +45,9 @@ jobs:
           bash scripts/ci/setup-python-venv.sh \
             --repo-dir "$PWD" \
             --venv-dir "$PWD/venv" \
+            --skip-requirements \
             --mode copy \
-            --extra-packages "pytest-cov pytest-mock pytest-timeout locust"
+            --extra-packages "pytest pytest-cov pytest-mock pytest-timeout pytest-asyncio locust"
           echo "✅ Python environment ready"
 
       - name: Run linting