fix: add missing allowlist_externals for tox-ansible environments (#12) [skip ci]

* fix: add missing allowlist_externals for tox-ansible environments

tox-ansible auto-generates test environments that use echo, git,
ansible-galaxy, ansible-test, ansible-doc, pytest, mkdir, ln, and sh
in commands_pre/commands. Without allowlist_externals, tox 4.x rejects
these with "echo is not allowed, use allowlist_externals to allow it",
causing all unit and integration test environments to fail.

* fix: let tox-ansible manage test commands instead of overriding

* fix: add distlib to integration requirements for manifest support

* fix: add distlib to testenv deps for galaxy/sanity manifest support

* fix: remove testenv overrides — only set allowlist_externals, let tox-ansible manage deps/commands

* fix: add distlib to galaxy tox env for manifest support

* fix: restore original testenv config, only add allowlist_externals

Author: stevefulme1

tests/integration/requirements.txt

@@ -1 +1,2 @@
 # Add python packages that are required for integration testing
+distlib

tox-ansible.ini

@@ -51,8 +51,15 @@ skip_install = false
 allowlist_externals =
     bash
     echo
+    git
     mkdir
     sh
+    ade
+    ansible-galaxy
+    ansible-test
+    ansible-doc
+    pytest
+    ln
 commands =
     bash -c 'git init --initial-branch=main .'
     bash -c 'ansible-test integration'