build: improve workflows logic. (#2801)

.github/workflows/go-build-test.yml

@@ -2,11 +2,7 @@ name: Go Build Test
 
 on:
   push:
-    branches:
-      - main
   pull_request:
-    branches:
-      - main
     paths-ignore:
       - '**/*.md'
 

.github/workflows/merge-from-milestone.yml

@@ -17,9 +17,6 @@ on:
         required: true
         default: 'pre-release-v3.8.2'
 
-  schedule:
-    - cron: '0 2 * * 0'
-
 env:
   MILESTONE_NAME: ${{ github.event.inputs.milestone_name || 'v3.8.2' }}
   TARGET_BRANCH: ${{ github.event.inputs.target_branch || 'pre-release-v3.8.2' }}