agent-platform release v4.105.0-rc.3

Added

• Examples/runtime-slice.yaml, the runtime slice for workload clusters in #766 by @teemow
• (klaus-gateway) Admit the 4.x chart line — slack.progress.mode is deleted there in #767 by @fiunchinho

Changed

• Regenerate tests/golden/ on Renovate and Dependabot branches in #768 by @teemow

Full Changelog: https://github.com/giantswarm/agent-platform/compare/v4.104.0...v4.105.0-rc.3