[CI] Use changelog-generator for release-notes

Remove temp workflow for debugging

.github/workflows/release-notes.yml

@@ -1,31 +0,0 @@
-name: Prepare Release Notes
-
-on:
-  workflow_dispatch:
-    inputs:
-      releaseVersion:
-        description: 'Version to create release notes for'
-        required: true
-        type: string
-
-jobs:
-  prepare_release_notes:
-    if: github.repository == 'spring-projects/spring-pulsar'
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: spring-io/spring-gradle-build-action@v2
-      - name: Install tooling for Github release
-        run: |
-          curl -sSL -O https://github.com/spring-io/github-changelog-generator/releases/download/v0.0.8/github-changelog-generator.jar
-      - name: Create Github release
-        env:
-          VERSION: ${{ inputs.releaseVersion }}
-          RELEASE_NOTES_FILE: ${{runner.temp}}/release_notes.md5
-          GH_TOKEN: ${{ secrets.GH_ACTIONS_REPO_TOKEN }}
-        run: |
-          java -jar github-changelog-generator.jar \
-            --spring.config.location=.github/changelog-generator.yml \
-            $VERSION $RELEASE_NOTES_FILE
-          
-          cat $RELEASE_NOTES_FILE