Fix lingering timers in bluetooth (part 1)

[epenet]

Proposed change

Linked to #91360
https://github.com/home-assistant/core/actions/runs/4729883045/jobs/8393069269?pr=91360

ERROR tests/components/bluetooth/test_init.py::test_discover_new_usb_adapters - Failed: Lingering timer after job <Job call_later 125 HassJobType.Coroutinefunction <function async_setup.<locals>._async_call_debouncer at 0x7fe6bfaad5a0>>
ERROR tests/components/bluetooth/test_init.py::test_discover_new_usb_adapters_with_firmware_fallback_delay - Failed: Lingering timer after test <TimerHandle when=879.731116588 Debouncer._on_debounce() created at /home/runner/work/core/core/homeassistant/helpers/debounce.py:149>

Type of change

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• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @bdraco, mind taking a look at this pull request as it has been labeled with an integration (bluetooth) you are listed as a code owner for? Thanks!

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[bdraco]

Maybe save the job in a local var so it doesn't get recreated every time?