48218 Remove unused public static members of private classes/enums (cla: yes, framework, team, waiting for tree to go green)

48244 Roll engine cbdc7bde224c..3851981b863a (1 commits) (autoroller: commit, cla: yes)

48250 Cache the path context in the flutter tool (cla: yes, tool)

48251 update gitignore and xcode changes to macOS project for flutter gallery (cla: yes, d: examples, team, team: gallery)

48254 Reverse the sense of the terms snippet and sample. (a: accessibility, a: tests, cla: yes, d: api docs, d: examples, documentation, f: cupertino, f: material design, framework, team, waiting for tree to go green)