ReactiveX / RxPY / 24926663473

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test: fix pyright strict-mode errors in 16 files in tests/test_observable/ (#780)

Fix pyright strict-mode type annotation errors in a batch of test files
in tests/test_observable/ that have 5 or fewer errors each. This is the
first step toward eventually removing tests/test_observable/ from the
pyright exclude list in pyproject.toml.

Patterns fixed:
- Add type annotations to _raise helper (ex: Exception) -> None in 7 files
- Delete unused _raise helper functions in 3 files
- Add type annotations to on_error, predicate, comparer, __init__ functions
- Fix float vs int ticks in TestScheduler assertions (test_timer)
- Remove unused import (test_utility_fluent)
- Replace unused variable with _ (test_windowing_fluent)
- Add # type: ignore[assignment] for single_or_default_async return type
  mismatch caused by default_value: _T = None widening _T to include None

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