Fix Webdriver BiDi events duplication #56803
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foolip
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foolip
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…okens and event filtering.
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wpt-pr-bot
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…y moving event listener registration to `setup` and using an instance variable for async exceptions.
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infrastructure/testdriver/bidi/subscription.html test
foolip
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Addressing #56985.
The events were duplicated, as the same Webdriver BiDi session has multiple event processors, causing testdriver.js notified about the same event several times. Fixed by setting up events forwarding only on test setup.
Failure example: https://github.com/web-platform-tests/wpt/pull/56779/checks?check_run_id=58288772050