84728 Retry dev/snippets git status, deflake snippets generator (team, cla: yes, waiting for tree to go green)

84755 migrate host_agent to null safety (team, cla: yes, waiting for tree to go green)

84809 Make scrollbar assertions less aggressive (a: tests, team, framework, f: scrolling, cla: yes, f: cupertino, d: api docs, d: examples, waiting for tree to go green, documentation, a: error message, tech-debt)

84812 Disable auto scrollbars on desktop for legacy flutter gallery (a: tests, team, framework, team: gallery, f: scrolling, cla: yes, waiting for tree to go green, integration_test, tech-debt)