Make all doc fragments, module utils, and plugin utils private (#11896)

* Make all doc fragments private.

* Make all plugin utils private.

* Make all module utils private.

* Reformat.

* Changelog fragment.

* Update configs and ignores.

* Adjust unit test names.

plugins/doc_fragments/auth_basic.py

@@ -1,29 +0,0 @@
-# Copyright (c) Ansible project
-# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
-# SPDX-License-Identifier: GPL-3.0-or-later
-
-from __future__ import annotations
-
-
-class ModuleDocFragment:
-    # Standard files documentation fragment
-    DOCUMENTATION = r"""
-options:
-  api_url:
-    description:
-      - The resolvable endpoint for the API.
-    type: str
-  api_username:
-    description:
-      - The username to use for authentication against the API.
-    type: str
-  api_password:
-    description:
-      - The password to use for authentication against the API.
-    type: str
-  validate_certs:
-    description:
-      - Whether or not to validate SSL certs when supplying a HTTPS endpoint.
-    type: bool
-    default: true
-"""