81555 [flutter_tools] skip additional flaky test (tool, cla: yes, waiting for tree to go green)

81561 Minor cleanup to Linux application template format (tool, cla: yes, waiting for tree to go green)

81576 [flutter_tools] Make bundle sksl a define (tool, cla: yes, waiting for tree to go green)

81578 Enable library_private_types_in_public_api lint (a: tests, team, tool, framework, f: material design, a: accessibility, cla: yes, f: cupertino, d: examples, waiting for tree to go green)

81581 Flutter Web Loading Indicator (tool, cla: yes, waiting for tree to go green)

81586 Enable Dart plugin registrant on Desktop only  (tool, cla: yes)