69624 Say [APP] instead of [Gallery] in web benchmarks (cla: yes, team, waiting for tree to go green)

69629 Initial migration of metrics_center (cla: yes, severe: performance, team, team: infra)

69630 Update plugins dependencies for the Gallery test (a: null-safety, a: tests, cla: yes, team, tool)

69631 Revert TextField.adaptive (cla: yes, f: material design, framework)

69633 mark flaky tests as flaky (cla: yes, team, tool)

69641 Revert “Build App.framework directly to build directory” (cla: yes, tool)

69644 Center the AnimatedPositioned code sample (cla: yes, d: api docs, framework, waiting for tree to go green)