Do not automatically generate change notes (#5243)

## Motivation
Since we track changes manually in `CHANGELOG.md` we do not want to add a generated changelog to our releases

## Changes
- remove auto-generated release notes

## Test Plan
n/a

## TODO
<!-- This section should be removed when all items are complete -->
- [x] Explain motivation or link existing issue(s)
- [x] Test changes and document test plan
- [x] Update documentation as needed
- [x] Update [changelog](../CHANGELOG.md) as needed

.github/workflows/release.yml

@@ -107,6 +107,5 @@ jobs:
             - Linux arm64: https://storage.googleapis.com/${{ secrets.GCP_BUCKET }}/${{ github.ref_name }}/Linux_ARM64.zip
 
             For information about changes in this release see the [changelog](https://github.com/spacemeshos/go-spacemesh/blob/${{ github.ref_name }}/CHANGELOG.md).
-          generate_release_notes: true
           draft: false
           prerelease: true