Remove blanket skips for Python 3 in CI (#10043)

* Remove blanket skips for Python 3 in CI.

* Try to fix hg tests.

* Disable hg tests.

* Drop restriction of supervisor to <4.0.0.

This was introduced in https://github.com/ansible/ansible/pull/54935.

* Make tests work with supervisorctl 4.0.0.

According to https://supervisord.org/changes.html#id12,
"supervisorctl will now set its exit code to a non-zero value when an error condition occurs."
I'm not sure why a stopped service in 'status' constitutes an error condition,
but whatever 🤷...

* Use correct Python executable.

* Skip RHEL/macOS; diff on config write.

* Skip CentOS 7 and OpenSuSE on ansible-core 2.16.

tests/integration/targets/hg/aliases

@@ -3,5 +3,6 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 azp/posix/2
-skip/python3
 skip/aix
+skip/macos
+disabled  # TODO osdn.net is out of business, so cloning a repo from there does not work

tests/integration/targets/hg/meta/main.yml

@@ -6,3 +6,4 @@
 dependencies:
   - setup_pkg_mgr
   - setup_remote_tmp_dir
+  - setup_epel

tests/integration/targets/hg/tasks/install.yml

@@ -26,6 +26,12 @@
   shell: apt-get -y update && apt-get -y install mercurial
   when: ansible_facts.pkg_mgr == 'apt'
 
+- name: install packages (apk)
+  package:
+    name: mercurial
+    state: present
+  when: ansible_facts.pkg_mgr in ['apk', 'community.general.apk']
+
 - name: install mercurial (dnf)
   dnf:
     name: mercurial
@@ -36,6 +42,11 @@
     name: mercurial
   when: ansible_facts.pkg_mgr == 'yum'
 
+- name: install mercurial (pacman)
+  package:
+    name: mercurial
+  when: ansible_facts.pkg_mgr in ['pacman', 'community.general.pacman']
+
 - name: install mercurial (pkgng)
   package:
     name: mercurial

tests/integration/targets/hg/tasks/uninstall.yml

@@ -16,6 +16,12 @@
     line: "#!{{ stat_hg_interpreter.stat.path }}"
   when: stat_hg_interpreter.stat.islnk
 
+- name: uninstall packages which were not originally installed (apk)
+  package:
+    name: mercurial
+    state: absent
+  when: ansible_facts.pkg_mgr in ['apk', 'community.general.apk']
+
 # using the apt module prevents autoremove from working, so call apt-get via shell instead
 - name: uninstall packages which were not originally installed (apt)
   shell: apt-get -y remove mercurial && apt-get -y autoremove
@@ -33,6 +39,12 @@
   shell: yum -y autoremove mercurial
   when: ansible_facts.pkg_mgr == 'yum'
 
+- name: uninstall packages which were not originally installed (pacman)
+  package:
+    name: mercurial
+    state: absent
+  when: ansible_facts.pkg_mgr in ['pacman', 'community.general.pacman']
+
 - name: uninstall packages which were not originally installed (pkgng)
   package:
     name: mercurial