Fixes #38814 - Remove SCA-irrelevant Candlepin event handling

[jeremylenz]

theforeman/puppet-candlepin#273
theforeman/puppet-candlepin#274
theforeman/foremanctl#247

^ these should be merged first they're merged now

What are the changes introduced in this pull request?

🤖 Generated with Claude Code

Co-Authored-By: Claude noreply@anthropic.com

Remove handling of the following Candlepin events as they are
irrelevant in SCA orgs:

• entitlement.created and entitlement.deleted - related to
  attaching subscriptions to hosts
• compliance.created - used to update host subscription status
• system_purpose_compliance.created - used to update host system
  purpose status

Also removed orphaned methods that were no longer called:

• EventHandler: subscription_facet and reindex_consumer
• MessageHandler: create_pool_on_host, remove_pool_from_host,
  and subscription_facet_host_ids

Considerations taken when implementing this change?

Installer changes should be in place first.

What are the testing steps for this pull request?

Make sure the following continue to work as expected:
Manifest refresh / import
Host content access

Summary by Sourcery

Remove support for SCA-irrelevant Candlepin events and clean up associated code, tests, and fixtures.

Enhancements:

• Drop handling branches for entitlement.created, entitlement.deleted, compliance.created, and system_purpose_compliance.created events in the event handler
• Remove orphaned methods related to dropped event handling from event and message handler classes

Tests:

• Delete test cases for entitlement.created, entitlement.deleted, and compliance.created events
• Remove obsolete fixture files for dropped events

Summary by Sourcery

Remove support for Candlepin events that are irrelevant to SCA orgs and clean up associated code and tests

Enhancements:

• Drop handling of entitlement.created, entitlement.deleted, compliance.created, and system_purpose_compliance.created events in the event and message handlers

Tests:

• Delete test cases and fixture files for the removed Candlepin events

Chores:

• Remove orphaned methods for pool-on-host management and event reindexing

[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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[jeremylenz]

Removed handling of the owner_content_access_mode.modified events. Also updated theforeman/foremanctl#247 and opened a new PR theforeman/puppet-candlepin#274 since the puppet-candlepin one was already merged

[jeremylenz]

All installer changes are now merged.

[lfu]

All import manifest, refresh manifest, install errata and install a package worked well.