85150 Fix SnackBar assertions when configured with theme (severe: crash, framework, f: material design, cla: yes, a: quality, waiting for tree to go green, a: error message)

severe: API break - 4 pull request(s)

80756 Migrate LogicalKeySet to SingleActivator (a: tests, a: text input, team, framework, f: material design, severe: API break, cla: yes, f: cupertino)

83923 Remove deprecated hasFloatingPlaceholder (team, framework, f: material design, severe: API break, cla: yes, waiting for tree to go green, tech-debt)

83924 Remove TextTheme deprecations (team, framework, f: material design, severe: API break, cla: yes, waiting for tree to go green, tech-debt)