87557 [NNBD] Update dart preamble code. (framework, f: material design, cla: yes)

87595 Added time picker entry mode callback and tests (framework, f: material design, cla: yes)

87604 Use Device specific gesture configuration for scroll views (a: tests, framework, cla: yes, waiting for tree to go green)

87607 Wait for module UI test buttons to be hittable before tapping them (team, cla: yes, team: flakes, waiting for tree to go green)

87618 Fix AnimatedCrossFade would focus on a hidden widget (framework, a: animation, cla: yes, f: focus)

87619 Don’t set the SplashScreenDrawable for new projects (tool, cla: yes, waiting for tree to go green)