81859 remove unnecessary String.toString() (a: tests, team, tool, framework, f: material design, cla: yes, waiting for tree to go green)

81879 Standardize build system environment defines derived from build info (tool, cla: yes, waiting for tree to go green)

81927 [flutter_releases] Flutter Beta 2.2.0-10.3.pre Framework Cherrypicks (team, tool, framework, engine, f: material design, a: internationalization, cla: yes)

81942 Add posix permission chown suggestion to io error handling (tool, cla: yes, waiting for tree to go green)

81951 Disable flutter_build_with_compilation_error_test on Windows (tool, cla: yes)

81961 Only skip license initialization on flutter test binding (a: tests, team, tool, framework, cla: yes, waiting for tree to go green)