chore: Update release please pr title (#9546)

* test: test PR title in separate branch

* add pull-request-header for test as well

* use group prefix

* remove variable

* update to use group prefix

* remove singular title pattern

* remove header

* remove edit to manifest.json

* update to the correct pattern

release-please-config.json

@@ -3,6 +3,7 @@
   "versioning": "always-bump-minor",
   "separate-pull-requests": false,
   "include-component-in-tag": false,
+  "group-pull-request-title-pattern": "chore(${branch}): release ${version}",
   "packages": {
     ".": {
       "extra-files": ["java-accessapproval/README.md"]