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/module_utils/_onepassword.py

@@ -0,0 +1,34 @@
+# Copyright (c) Ansible project
+# Simplified BSD License (see LICENSES/BSD-2-Clause.txt or https://opensource.org/licenses/BSD-2-Clause)
+# SPDX-License-Identifier: BSD-2-Clause
+
+# Note that this module util is **PRIVATE** to the collection. It can have breaking changes at any time.
+# Do not use this from other collections or standalone plugins/modules!
+
+from __future__ import annotations
+
+import os
+
+
+class OnePasswordConfig:
+    _config_file_paths = (
+        "~/.op/config",
+        "~/.config/op/config",
+        "~/.config/.op/config",
+    )
+
+    def __init__(self) -> None:
+        self._config_file_path = ""
+
+    @property
+    def config_file_path(self) -> str | None:
+        if self._config_file_path:
+            return self._config_file_path
+
+        for path in self._config_file_paths:
+            realpath = os.path.expanduser(path)
+            if os.path.exists(realpath):
+                self._config_file_path = realpath
+                return self._config_file_path
+
+        return None