[PR #11686/68ae04a9 backport][stable-12] Cleanup of aliases skip statements (#11709)

Cleanup of `aliases` skip statements (#11686)

* add scripts to clean aliases' skips

* remove legacy skips

* code cosmetics

* add license to ALIASES.md

* Fix typos in ALIASES.md documentation

* rolling back freebsd14.2 and 14.3 in iso_extract

* fix versions and re-run

(cherry picked from commit 68ae04a95a)

Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>

tests/utils/ALIASES.md

@@ -0,0 +1,38 @@
+<!--
+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
+-->
+
+# Cleaning up `aliases` skips
+
+The skip statements in `tests/integration/targets/*/aliases` files may contain specific OSes and their versions.
+
+For example:
+
+    skip/rhel8.8
+    skip/centos6
+    skip/macos
+
+Those items being skipped are called `remotes` and they come from the file `test/lib/ansible_test/_data/completion/remote.txt`
+in the `ansible-core` repository. Eventually, these remotes are removed from that `ansible_test` config,
+but they keep silently cluttering the aliases files here.
+
+The scripts `list-remotes` and `clean-aliases-skips` can help you remove those entries from the `aliases` files.
+For that, you will need to have a clone of the `ansible-core` repository in your machine.
+
+In the example below, the path to that repo is `../ansible`:
+
+```shell
+./tests/utils/list-remotes ../ansible
+```
+
+**Note:** The supported versions of `ansible-core` are hardcoded in `list-remotes`. Those should be updated or automated in the future.
+
+To remove all the skips that are **not** in that list, you should run:
+
+```shell
+./tests/utils/list-remotes ../ansible | ./tests/utils/clean-aliases-skips
+```
+
+Make sure to thoroughly review the changes before committing!