Align workflows with other OpenTelemetry Java repositories

Note: gradle-wrapper-validation.yml intentionally keeps merge_group trigger
since this repo has merge queues enabled

Author: trask

.github/workflows/gradle-wrapper-validation.yml

@@ -2,9 +2,6 @@ name: Gradle wrapper validation
 
 on:
   push:
-    branches:
-      - main
-      - release/*
   pull_request:
   merge_group:
 
@@ -17,4 +14,5 @@ jobs:
     steps:
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
+      # this needs to be in its own workflow in order to make OSSF scorecard happy
       - uses: gradle/actions/wrapper-validation@4d9f0ba0025fe599b4ebab900eb7f3a1d93ef4c2 # v5.0.0