feat: add Optimize to monorepo release notes

[misiekhardcore]

This PR adds Optimize to the release note generation.

related to camunda/camunda#22258

[misiekhardcore]

I think the GH token is missing permissions to read from camunda/camunda-optimize repository

[aabouzaid]

LGTM, but I will leave this to @jessesimpson36 as he worked on it more and has more details about it.

[jessesimpson36]

Won't optimize be part of the monorepo for future releases and not camunda-optimize?

[misiekhardcore]

@jessesimpson36 Optimize is a part of the monorepo already but we are not a part of the single jar yet. The plan is to make it part of the single jar soon-ish. Does this mean that this PR is not needed?

[jessesimpson36]

It looks like the release notes in the monorepo don't have any content.
https://github.com/camunda/camunda/releases/tag/8.6.0-optimize

for the release notes tool inside this repo, it needs a source with actual release notes. If that's in the camunda/camunda repo, then this repo should fetch from there instead of camunda-optimize. I would suggest figuring out how the release notes will be in the camunda/camunda repo before trying to change the camunda-platform repo.

[misiekhardcore]

Okay, I close this for now until we get clearer view on what needs to be done here especially that the release notes generation is looked into in general in the monorepo