71756 Correct text selection pivot points (cla: yes, f: material design, framework, waiting for tree to go green)

71757 Rename IOSMigrator -> ProjectMigrator (cla: yes, tool, waiting for tree to go green)

71760 Make macrobenchmarks buildable for macos (a: tests, cla: yes, platform-mac, team)

71761 Check in manual_tests gitignores (cla: yes, platform-mac, team)

71764 Move embedding and linking macOS Flutter frameworks into the tool (cla: yes, team, tool)

71771 Roll Engine from 59b4baea5124 to 6e0c7e493162 (12 revisions) (cla: yes, waiting for tree to go green)