Add tests for user installable apps integration features

[coderabbitai]

Testing Needed

This issue is created to track the need for tests of the user installable apps integration feature added in PR #57.

Areas requiring tests:

1. CommandManager:

   • Test command registration with user contexts
   • Test integration type settings (setIntegrationTypes(IntegrationType.ALL))
   • Test that commands are properly registered with the correct contexts and integration types
   • Test subcommand registration with integration types

2. ReplyContext:

   • Test the detached channel check in the listenOnce method
   • Test error handling when a channel is detached
   • Test normal operation when channel is not detached

References

• PR: Full support for user installable apps integration #57
• Requested by: @Scyye