(chore): Simplify CI triggers to pull_request only

Author: abnegate

.github/workflows/integration.yml

@@ -1,10 +1,7 @@
 name: Integration Tests
 
 on:
-  push:
-    branches: [main]
   pull_request:
-    branches: [main]
 
 jobs:
   integration:

.github/workflows/lint.yml

@@ -1,10 +1,7 @@
 name: Lint
 
 on:
-  push:
-    branches: [main]
   pull_request:
-    branches: [main]
 
 jobs:
   pint:

.github/workflows/static-analysis.yml

@@ -1,10 +1,7 @@
 name: Static Analysis
 
 on:
-  push:
-    branches: [main]
   pull_request:
-    branches: [main]
 
 jobs:
   phpstan: