Only run model templates tests once (#10388)

.github/workflows/model-templates.yml

 name: Model templates runner
 
 on:
-  push:
+  pull_request:
     paths:
       - "src/**"
       - "tests/**"
       - ".github/**"
       - "templates/**"
-  pull_request:
     types: [assigned, opened, synchronize, reopened]
 
 jobs: