backstage release v2.93.0

(agent-platform) Port to kagent api.kagent.dev/v1alpha3 Agents and Sessions in #2727 by @QuentinBisson

Align files according to platform standards in #2814 by @giantswarm-align-files[bot]

(plans) The Hive team filter narrows Now, History and Plans in #2806 by @teemow
(gs) Drop the Alerts link from the cluster details page’s default links in #2816 by @marians
(plans) Hive tabs and Plans page wait out a paused retry in #2817 by @teemow
(agent-platform) Offer the pull request only for deleting an agent applied from git in #2818 by @marians
(gs) Scope the Deployments page’s Mimir queries by cluster, retry once in #2825 by @teemow
(gs) Keep the router state when the installation scope writes the URL in #2821 by @marians
(agent-platform) Normalise an attachment’s base64 without a regex in #2824 by @teemow
(build) Define the tsc heap size once, in scripts/tsc.sh in #2826 by @teemow

Full Changelog: https://github.com/giantswarm/backstage/compare/v2.92.2...v2.93.0