agent-platform release v4.103.0

gitops.prereleases widens the agent chart line agent-manager composes for every agent. On, agent-manager.agentChart.semver admits pre-releases (>=1.5.0 <2.0.0 renders >=1.5.0-0 <2.0.0-0) and agent-manager.agentChart.semverFilter is the release tag filter, in the agent-manager release and in the connectivity release, whose migrate Job passes it as AGENT_CHART_SEMVER_FILTER. An agentChart with its own semverFilter, or pinned to an exact version, is left as written. components.agent-manager.versionRange moves to >=1.7.0 <2.0.0 and agentManager.migration.image.tag to 1.7.0, the first agent-manager whose schema and migrate take agentChart.semverFilter.