68657 Enable dev/bots/ build_tests for Windows (a: desktop, cla: yes, platform-windows, team)

68658 Enable dev/bots/ build_tests for Linux (a: desktop, cla: yes, platform-linux, team)

68708 Refactor update_icons (cla: yes, team)

68714 Revert “enable unnecessary_string_escapes and use_raw_strings” (a: internationalization, a: tests, cla: yes, f: cupertino, f: material design, framework, team, tool)

68723 [null-safety] try updating snippets for null safety (cla: yes, f: cupertino, f: material design, team)

68726 Remove dartdoc checker exclusion for class and library files (cla: yes, team)