feat(release): Replace release bot with GH app

[Jeffreyhung]

More details: https://www.notion.so/sentry/DACI-Replace-GitHub-bot-accounts-with-GitHub-Apps-getsentry-release-15109965d1204a91b9be71c49e8b66e0?pvs=4

[beliaev-maksim]

@Jeffreyhung that is not very convenient when notes for open source project are published in internal source. That lowers the visibility on decisions

[Jeffreyhung]

@beliaev-maksim appreciate the feedback, we are making this change across 70+ repos and I didn't find a suitable place in our GitHub to put it, so I put it in Notion to save some duplicate contents across the 70+ repos.

But for more context, the getsentry-release is a GitHub bot account that is used in various automation, and the ${{ secrets.GH_RELEASE_PAT }} is a personal access token from that bot account. We are using a regular GitHub account as a bot while it should be a non-human account since there are no humans behind it. Hence, we are replacing it with a GitHub App. Functionality wise, there will be no difference.

[beliaev-maksim]

That makes sense, thanks for the context!