Fixes #31096 - remove config group migrations

These migrations had been added to the plugin foreman_puppet_enc.
Details of addition https://github.com/theforeman/foreman_puppet_enc/pull/13

Fixes #31732 - drop env from TemplateCombination migration

Drop environment relation from TemplateCombination migrations.

Fixes #32652 - task to purge puppet data

Adds rake task to purge all puppet data for users who do not choose to use puppet.

Fixes #32893 - use setting DSL for General category

This uses our new DSL to define the General settings, this showcases how
to use the new DSL and other categories should follow in the same
release.

Fixes #33180 - add task to migrate Puppet info

Adds task to migrate Puppet provisioning info to Host parameters.

Fixes #31370 - multi-host stub template snapshots (#8149)

Our snapshot template render test and generator only supports one host stub (ipv4 single NIC redhat OS). In order to test more ERB codepaths, we need a way to create snapshots against multiple host stubs (e.g. IPv6, dualstack, static IPv4 or IPv6, debian family). In order to do that, template metadata can be extended to define list of host stubs to create and test snapshots against....

Fixes #31399 - snapshot tests exclude plugins

Fixes #32242 - Drop db_pending_migration setting

This setting was used in the past by the installer to determine whether
or not the database needs to be migrated, but that is no longer the
case.

Fixes #31884 - Correctly warn about wrong logging layout

When running `rake errors:fetch_log`, if the logging layout isn't set to
`multiline_request_pattern` the task errors out because `$STDERR` doesn't
exist. This is a typo, it should have been `$stderr`, but since we use...

Fixes #31233 - Clean up deprecations for 2.4 and older