[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>

tests/unit/plugins/modules/test_cpanm.yaml

@@ -7,6 +7,7 @@
 - id: install_dancer_compatibility
   input:
     name: Dancer
+    mode: compatibility
   output:
     changed: true
   run_command_calls:
@@ -23,6 +24,7 @@
 - id: install_dancer_already_installed_compatibility
   input:
     name: Dancer
+    mode: compatibility
   output:
     changed: false
   run_command_calls:
@@ -34,7 +36,6 @@
 - id: install_dancer
   input:
     name: Dancer
-    mode: new
   output:
     changed: true
   run_command_calls:
@@ -46,6 +47,7 @@
 - id: install_distribution_file_compatibility
   input:
     name: MIYAGAWA/Plack-0.99_05.tar.gz
+    mode: compatibility
   output:
     changed: true
   run_command_calls:
@@ -57,7 +59,6 @@
 - id: install_distribution_file
   input:
     name: MIYAGAWA/Plack-0.99_05.tar.gz
-    mode: new
   output:
     changed: true
   run_command_calls: