agent-platform release v4.49.0

Added

• The three upstream lines at their decoupled releases — kagent 1.0.0, Substrate 1.0.0, agentgateway 2.0.0 in full (#608) in #609 by @teemow

Full Changelog: https://github.com/giantswarm/agent-platform/compare/v4.48.2...v4.49.0