80161 Move gradle_non_android_plugin_test from its own test builders into tools integration.shard (a: tests, team, tool, cla: yes, waiting for tree to go green)

80163 Mark mac_gradle_plugin_light_apk_test flaky (team, cla: yes, team: flakes)

80168 Migrate features_tests and other tool tests to null safety (team, tool, cla: yes, waiting for tree to go green, a: null-safety)

80171 Reduce number of project creates in gradle_plugin_*_apk_tests (team, cla: yes, waiting for tree to go green)

80172 Cache location of Java binary in devicelab tests (a: tests, team, cla: yes, waiting for tree to go green, team: infra)