#15759 Fix it.concurrent not working with describe.skip

[eyalroth]

Fixes #15759.

Bug introduced in #15381.

Also attempts to fix flaky concurrency tests in e2e/__tests__/circusConcurrent.test.ts (example) by applying a factor on the delays in the tests. The differences between the delays were not long enough to ensure that they will keep a consistent ordering of the tests execution.

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commit: 2431cca

[eyalroth]

@madcapnmckay do you mind reviewing this?