fix: Make conventional commit action run only on main (#1312)

### Description of Changes
Make Conventional commit action run only on PR to main
Get rid of 'release' type since we can use `chore(release):`

Author: hanbyul-here

.github/workflows/conventional-commit.yml

@@ -1,15 +1,16 @@
-name: PR Title Checks
+name: PR Title Check
 
 on:
   pull_request:
+    branches: [main]
     types: [opened, synchronize, reopened, edited]
 
 jobs:
-  validate-pr-title:
+  conventional-commit-check:
     runs-on: ubuntu-latest
     steps:
       - name: Conventional Commit Validation
         uses:  ytanikin/[email protected]
         with:
-          task_types: '["feat","fix", "docs", "test", "ci", "refactor", "chore", "revert", "release"]'
+          task_types: '["feat","fix", "docs", "test", "ci", "refactor", "chore", "revert"]'
           add_label: 'false'