Deprecate `event_loop_policy` fixture #3043

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ubuntu - Python 3.11	56s
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ubuntu - Python 3.10	1m 9s
windows - Python 3.11	1m 47s
ubuntu - Python 3.14	55s
ubuntu - Python 3.12	59s
windows - Python 3.12	1m 2s
windows - Python 3.10	1m 9s
ubuntu - Python 3.13	1m 9s
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windows - Python 3.14	1m 2s
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	15m 55s

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