Turn off linting by default in VS Code for Python (#449)

* Turn off linting by default in VS Code for Python
Linting is on by default if you specify the paths to any linters, so the previous settings would turn on **all** linters.

Also drop linters that don't see much use.

* Fix tests

* Revert all changes

* Remove paths to under-utilized tools and turn off all linting by default

* Bump the version number

src/python/devcontainer-feature.json

 {
   "id": "python",
-  "version": "1.0.20",
+  "version": "1.0.21",
   "name": "Python",
   "documentationURL": "https://github.com/devcontainers/features/tree/main/src/python",
   "description": "Installs the provided version of Python, as well as PIPX, and other common Python utilities.  JupyterLab is conditionally installed with the python feature. Note: May require source code compilation.",
@@ -63,13 +63,12 @@
         "python.defaultInterpreterPath": "/usr/local/python/current/bin/python",
         "python.formatting.autopep8Path": "/usr/local/py-utils/bin/autopep8",
         "python.formatting.blackPath": "/usr/local/py-utils/bin/black",
-        "python.formatting.yapfPath": "/usr/local/py-utils/bin/yapf",
-        "python.linting.banditPath": "/usr/local/py-utils/bin/bandit",
         "python.linting.flake8Path": "/usr/local/py-utils/bin/flake8",
+        "python.linting.flake8Enabled": false,
         "python.linting.mypyPath": "/usr/local/py-utils/bin/mypy",
-        "python.linting.pycodestylePath": "/usr/local/py-utils/bin/pycodestyle",
-        "python.linting.pydocstylePath": "/usr/local/py-utils/bin/pydocstyle",
-        "python.linting.pylintPath": "/usr/local/py-utils/bin/pylint"
+        "python.linting.mypyEnabled": false,
+        "python.linting.pylintPath": "/usr/local/py-utils/bin/pylint",
+        "python.linting.pylintEnabled": false
       }
     }
   },