Replace Python 2.7 workaround in 'bidi.BackgroundConsumer._thread_main' with 'Condition.wait_for' #15088
Description
See this note.
Blocked on merge of PR googleapis/python-api-core#212, dropping Python 2.7 support.
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See this note.
Blocked on merge of PR googleapis/python-api-core#212, dropping Python 2.7 support.