[9.0.0] Remove deprecated modules and features (#8198)

* Remove deprecated modules.

* Update BOTMETA.

* Update ignore.txt files.

* Bump collection version to 9.0.0.

* Change timeout from 10 to 60.

* Remove the alias autosubscribe of auto_attach.

* Change default of mode from compatibility to new.

* Remove deprecated classes.

* Remove mh.mixins.deps.DependencyMixin.

* Remove flowdock module.

* Remove proxmox_default_behavior option.

* Remove ack_* options.

* Remove deprecated command support.

* Change virtualenv behavior.

* Fix changelog.

* Remove imports of deprecated (and now removed) code.

* Fix tests.

* Fix sanity tests.

* Require Django 4.1.

* Use V() instead of C() for values.

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

* django_manage: improve docs for release 9.0.0

* markup

* fix doc notes in cpanm

---------

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

galaxy.yml

@@ -5,7 +5,7 @@
 
 namespace: community
 name: general
-version: 8.6.0
+version: 9.0.0
 readme: README.md
 authors:
   - Ansible (https://github.com/ansible)