components/gardena_bluetooth: Improve avaliability reliability

[alistair23]

Proposed change

The available() function incorrectly returns false even though the device is accessible.

The last_update_success property should correctly indicate if the device isn't contactable, so we don't need to call async_address_present(). This is confirmed by seeing that no other users are calling async_address_present() in the available() function.

This commit removes the call to async_address_present() to help fix the sensor being unavailable when using a ESPHome BLE proxy.

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[home-assistant]

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

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[elupus]

It should be okey. It does change so we require a connectable path. But it make more sense to just rely on the coordinator status. I wonder why i did this in the first place.

[elupus]

Please adjust for the ruff warnings.