mpm_event module management is not consistent

Describe the Bug

If mpm_event is enabled with apache::mod::event, using apache::mpm::disable_mpm_event will not disable it. Internally, at least on Debian 12, it looks like the event and mpm_event modules are identical, aside from the mpm_event module specifically warning about conflicts with other MPM modules. As a result, I believe it is a bug that the module's method to enable the module is not compatible with the way to disable the module.

Note: I will add a pull request with a patch to fix this behavior; I wanted an issue to link it against.

Expected Behavior

The expected behavior is that the Puppet module can both enable or disable mpm_event, based on variables such as host facts.

Steps to Reproduce

Steps to reproduce the behavior:

1. Apply a manifest to a system that includes mpm_event:

include apache::mod::event

2. Later, apply a different manifest to the same system that disables the same module:

include apache::mpm::disable_mpm_event

3. Module will still be enabled, as the class to enable uses the name without the mpm_ prefix, while the class to disable the module does use the mpm_ prefix.

Environment

• Version 12.1
• Platform Debian 12

Additional Context

The inconsistency is caused by the module being enabled with ${mpm} as `event``:
https://github.com/puppetlabs/puppetlabs-apache/blob/58dada69b92cc5b5b9155068db4f82fbb2ae9cac/manifests/mpm.pp#L49
https://github.com/puppetlabs/puppetlabs-apache/blob/58dada69b92cc5b5b9155068db4f82fbb2ae9cac/manifests/mpm.pp#L57

While the module is disabled with:
https://github.com/puppetlabs/puppetlabs-apache/blob/58dada69b92cc5b5b9155068db4f82fbb2ae9cac/manifests/mpm/disable_mpm_event.pp#L3

This is inconsistent with prefork and worker, which are enabled and disabled without the mpm_ prefix.

Start with manifests/mpm.pp at the referenced lines and manifests/mpm/disable_mpm_event.pp. Compare the module names used by the enable and disable classes, then reproduce the transition with the two manifests from the issue on Debian 12. Done means mpm_event can be enabled and later disabled consistently, without changing the existing prefork and worker behavior.