Fixes #38468 - Reset HostProxyInvocations when rebuilding a host

Rebuilding a provisioned host in-place generates new host ssh keys, but
does not reset the host-proxy mapping in the host_proxy_invocations
table. As a result, the ssh keys are not pruned from the known hosts
proxy file, and REX jobs won't succeed on the host because of the
offending keys. Resetting host-proxy mapping solves this issue.

Author: adamlazik1

app/models/concerns/foreman_remote_execution/host_extensions.rb

@@ -28,6 +28,8 @@ def self.prepended(base)
           end
         }
 
+        after_build :reset_host_proxy_invocations
+
         def search_by_job_invocation(key, operator, value)
           if key == 'job_invocation.result'
             operator = operator == '=' ? 'IN' : 'NOT IN'
@@ -46,6 +48,10 @@ def search_by_job_invocation(key, operator, value)
       end
     end
 
+    def reset_host_proxy_invocations
+      HostProxyInvocation.where(host_id: self.id).delete_all
+    end
+
     def cockpit_url
       ScriptExecutionProvider.cockpit_url_for_host(self.name)
     end