perf: improve bump-release command

Context: https://github.com/sablier-labs/command-center/issues/202#issuecomment-3380053926 > The changelog it creates is largely based on the commit history which is not natural since commit history can add some change and then remove it resulting into no change. So, feeding the following prompt to Claude generates a better changelog (still not perfect): ```md Instead of looking at the commit history, find the diff between staging and main branches and create a changelog based on that. Then find relevant PRs and add them to each changelog (optional). Ignore test and github workflow changes. ``` ------------------- The current version also mentions to skip commits that revert changes made after the last release. Inspite of that, it didn't work as expected. So, I am not certain if it would work deterministically with the new changes. However, I still think the new changes are an improvement.