60159 Make flutter create . on plugins also regenerates files for platforms already supported (cla: yes, tool, waiting for tree to go green)

60163 Consider the Linux template stable (cla: yes, tool)

60168 Roll Engine from 50da4ae2ca20 to 2a9fed87a7c2 (2 revisions) (cla: yes, waiting for tree to go green)

60172 [flutter_tools] start fixing command tests (cla: yes, tool)

60185 [gen_l10n] Update the arb filename parsing logic (a: internationalization, cla: yes, team, tool)

60187 Roll Engine from 2a9fed87a7c2 to a0deaf9b04dc (4 revisions) (cla: yes, waiting for tree to go green)