3588 [connectivity_macos] move NNBD to stable (cla: yes, nnbd, p: connectivity, platform-macos, waiting for tree to go green)

3591 [camera] Fix iOS rotation issue (cla: yes, p: camera, platform-ios, waiting for tree to go green)

3592 [camera] Fix example from README.md (cla: yes, p: camera, waiting for tree to go green)

3596 [connectivity] null safety stable release (cla: yes, nnbd, p: connectivity, waiting for tree to go green)

3614 [espresso] Update SDK requirement for null-safety (cla: yes, nnbd, p: espresso, waiting for tree to go green)