Jeff McGehee dd1608db0d Best effort state initialization of bayesian binary sensor (#30962)
* Best effort state initialization of bayesian binary sensor.

Why:

* https://github.com/home-assistant/home-assistant/issues/30119

This change addresses the need by:

* Running the main update logic eagerly for each entity being observed
  on `async_added_to_hass`.
* Test of the new behavior.

* Refactor in order to reduce number of methods with side effects that
mutate instance attributes.

* Improve test coverage

Why:

* Because for some reason my commits decreased test coverage.

This change addresses the need by:

* Adding coverage for the case where a device returns `STATE_UNKNOWN`
* Adding coverage for configurations with templates

* rebase and ensure upstream tests passed

* Delete commented code from addressing merge conflict.
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