chore: fix wrong trigger name for manually runnable workflow (#10077)

Author: paulbalandan

.github/workflows/test-random-execution.yml

@@ -25,7 +25,7 @@ on:
       - 'system/**.php'
       - 'tests/**.php'
 
-  workflow_call:
+  workflow_dispatch:
     inputs:
       quiet:
         description: Suppress debug output