4471 [in_app_purchase] add pedantic as a dependency to in_app_purchase plugins (cla: yes, p: in_app_purchase, platform-ios, platform-android)

4473 [ci] Add ‘main’ builders in bringup mode (cla: yes)

4474 [flutter_plugin_tools] Add ‘main’ support (cla: yes, waiting for tree to go green)

4475 Remove “pluginClass: none” from pubspecs (cla: yes, p: path_provider, p: shared_preferences, platform-windows, platform-linux)

4477 Add mirroring of master to main branch. (cla: yes)

4478 Adjust pull request template (cla: yes, waiting for tree to go green)