Flaky `test_aio` and `test_aio_local` CircleCI jobs

The test_aio and test_aio_local CircleCI jobs started to be quite flaky recently (~50% of attempts results in false-positive failures). Example of the recent failure can be found here. It looks like the same tests produce flaky results:

Chrome Headless 83.0.4103.0 (Linux x86_64) DocViewerComponent #render() (swapping views) should unsubscribe from the previous "swap" observable when unsubscribed from FAILED

and

Chrome Headless 83.0.4103.0 (Linux x86_64) DocViewerComponent #render() (embedding components) should unsubscribe from the previous "embed" observable when unsubscribed from FAILED

CC @gkalpak

[gkalpak]

Unfortunately, I haven’t been able to find the root cause (after several hours of investigating). See #37637 for some more info.

I have submitted #37673 to disable these tests for now.

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