backstage release v3.16.0

(agent-platform) Accept tls://host:port in Extra egress origins by @teemow — An agent’s Extra egress origins field accepts tls://<host>:<port>, e.g. tls://db.example.com:5432, for non-HTTP TLS services such as a database, beside http(s):// origins. Needs agent-manager 2.8.0 or later.
(agent-platform) Session workspace chip and drawer, Workspace column by @teemow — A session started in a workspace shows it in its header with the last sync and the repositories fetched fresh; clicking it lists the repositories, the session’s directory and its cleanup date. The Sessions list and the session rail name the workspace too.

Full Changelog: https://github.com/giantswarm/backstage/compare/v3.15.0...v3.16.0