gh-94174: asyncio.get_event_loop() fails if no current event loop

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asyncio.get_event_loop() now fails if there is no current event loop.
In Python 3.10, it emits a DeprecationWarning in this case.

• Issue: asyncio.get_event_loop() fails if there is no current event loop #94174

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Maybe the 2 modified tests can now be modified, I'm not sure if it's relevent to still tests all these cases, I'm not an asyncio expert. In case of doubt, I kept the tests :-)

The C implementation doesn't mention the thread name in the error message: same than _asyncio.get_running_loop().

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cc @asvetlov @serhiy-storchaka @1st1 @hugovk

[serhiy-storchaka]

How is it failed? #93454 has not be merged yet.

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I give up on this issue. I didn't take the best approach, and @serhiy-storchaka already has PR #93454 which is in good shape. Let's continue the effort on PR #93454.