Rollup merge of #105153 - oli-obk:fail_faster, r=compiler-errors

Create a hacky fail-fast mode that stops tests at the first failure

This is useful for not having to wait until all 10k+ ui tests have finished running and then having to crawl through hundreds of failure reports.

You now only get the first report when you turn on that env var and no new tests are run at all

This works like a charm, but is obviously welded on very crudely

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