remove merge group events from main workflow

.github/workflows/__job_messages.yml

@@ -23,7 +23,7 @@ on:
         type: boolean
       pr_number:
         required: true
-        type: number
+        type: string
       marker:
         description: Hidden marker to detect PR comments composed by the bot
         required: false

.github/workflows/pull_request.yml

@@ -11,7 +11,6 @@ on:
       - release*
     paths-ignore:
       - '**/*.md'
-  merge_group:
 
 jobs:
   build: