Move init container release from lambda to GHA

[hmstepanek]

Overview

We are getting rid of the internal auto-layer-releases repo and moving creating of the release tags into each agent's GHA deploy flow.

[kanderson250]

I think we should move this into its own workflow, to be run at the end of our release process.

I'm not super familiar with the init container process, but it looks like these changes will cut the init container release immediately. publish_release is the start of our release process. The agent jar generally isn't available on the downloads site, where the init container is looking for it, until a few days after this action is run.

[kanderson250]

Looks good, thank you! Will merge myself once release activities conclude this week.

[jtduffy]

Merging with AIT failures (token issue). New workflow action that AITs don't cover.