60018 [flutter_tools] switch linux desktop feature on (cla: yes, tool, waiting for tree to go green)

60021 reland “fix the widget span layout when text scale factor != 1” and h… (cla: yes, framework, waiting for tree to go green)

60041 Use assemble build system directly for build ios-framework (cla: yes, team, tool)

60042 Fix newly added test to opt out of NNBD (cla: yes, f: material design, framework)

60045 Check for Xcode 11 and Xcode 12 directory names in build_ios_framework_module_test (a: tests, cla: yes, platform-ios, team)

60059 Expose the ElevationOverlay functions so applications can use the directly. (cla: yes, f: material design, framework, waiting for tree to go green)