build_tools: Skip managerEvent combining for AMI action responses

AMI action responses can (and will) reference AMI events that they return.
These event references and definitions should not be combined with AMI events
raised elsewhere in the code, as they are specifically tied to the AMI action
that raised them.

ASTERISK-24156 #close
Reported by: Rusty Newton


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@420289 f38db490-d61c-443f-a65b-d21fe96a405b