Update start-release.sh
Update start-release.sh

- Run git commit as a part of the script.
- Remove the step to close the old project. Looks like `release` command
  already closes it.

Signed-off-by: Michi Mutsuzaki <a75494f12f73453b2bd75573f87b8f21fcc50565@isovalent.com>

cilium/cilium,cilium/cilium,cilium/cilium,cilium/cilium,cilium/cilium