I suggest creating a project to track tasks about selenium tests, to make it easier for reviewers to find relevant tasks with patches and for developers to find tasks to work on. Example tasks in the scope include
- MediaWiki-Core-Tests "Selenium" work board column
- T210726 and subtasks
- tasks to set up selenium tests in specific extensions, eg T284165/T262684/T284611
The project would also include our uses of WebdriverIO, so tasks like T274579