72833 Fix scrollbar configuration for hover events (a: desktop, cla: yes, f: material design, f: scrolling, framework, platform-web, waiting for tree to go green)

severe: new feature - 13 pull request(s)

62927 AutocompleteCore (a: text input, cla: yes, framework, severe: new feature)

66504 Re-land ScaffoldMessenger (a: quality, cla: yes, customer: money (g3), f: material design, framework, severe: new feature, waiting for tree to go green)

67947 Deprecate old SnackBar methods (cla: yes, f: material design, framework, severe: API break, severe: new feature, waiting for tree to go green)