[core] auto create release notes with every push on develop (#3985)

and remove CHANGELOG.md logic.

This is my attempt to create a draft release instead of editing a
changelog, see discussion on discord.

Logic:
- new github workflow `.github/workflows/release-notes.yaml`
- runs with every push on `develop` (so after PR's are merged)
- collects the commits on `develop` which are newer than the latest tag
- searches the commit messages for keywords defined in an array and
group the messages into categories (this is a first shot, we will update
this ...)
- creates markdown content
- looks for an untagged and unpublished draft release with name
`unreleased`, if it exists, it will be deleted
- creates an untagged and unpublished draft release with name
`unreleased` with markdown content created above

Example created on my fork (this caused having `MagicMirrorOrg` in the
PR-Links):

<img width="952" height="1804" alt="grafik"
src="https://github.com/user-attachments/assets/38687bed-f5da-4dcb-93eb-242c317769df"
/>

Please review this PR, it is a draft release at the moment because I got
problems in my fork where I tested this: The created draft release is
not visible at the moment (they are visible via api). AFAIS this is a
queue problem on GitHub, maybe I flooded their queue while testing ...
So I will test this tomorrow again before removing `draft` here.

.github/workflows/release-notes.yaml

@@ -0,0 +1,33 @@
+# This workflow writes a draft release on GitHub named `unreleased` after every push on develop
+
+name: "Create Release Notes"
+
+on:
+  push:
+    branches: [develop]
+
+permissions:
+  contents: write
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  release-notes:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: "0"
+      - name: "Use Node.js"
+        uses: actions/setup-node@v6
+        with:
+          node-version: lts/*
+          cache: "npm"
+      - name: "Create Markdown content"
+        run: |
+          export GITHUB_TOKEN=${{ secrets.GITHUB_TOKEN }}
+          node js/releasenotes.js