Add Balboa spa temperature range state control (high/low) (#115285)

* Add temperature range switch (high/low) to Balboa spa integration.

* Change Balboa spa integration temperature range control from switch to select

* Balboa spa integration: Fix ruff formatting

* Balboa spa integration: increase test coverage

* Balboa spa integration review fixes: Move instance attributes as class attributes. Fix code comments.

tests/components/balboa/conftest.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 from collections.abc import Callable, Generator
 from unittest.mock import AsyncMock, MagicMock, patch
 
-from pybalboa.enums import HeatMode
+from pybalboa.enums import HeatMode, LowHighRange
 import pytest
 
 from homeassistant.core import HomeAssistant
@@ -60,5 +60,6 @@ def client_fixture() -> Generator[MagicMock, None, None]:
         client.heat_state = 2
         client.lights = []
         client.pumps = []
+        client.temperature_range.state = LowHighRange.LOW
 
         yield client