Follow on from #37851 This may reduce CI time by running doctests in parallel with other tests. It also makes it easier to find the results. Example output: https://github.com/zed-industries/zed/actions/runs/17698218116/job/50300398669?pr=38111 At least on this run, the doctests finished before the main Linux tests, which makes sense because there are many fewer doctests. So they should not be on the critical path. Thanks @maxdeviant for the prompt. <img width="615" height="513" alt="image" src="https://github.com/user-attachments/assets/bcafa636-a68c-4602-97f4-61f7904e6a7b" /> Release Notes: - N/A