[esp32_hall] Add dummy component (#9125)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/esp32_hall/sensor.py

@@ -0,0 +1,5 @@
+import esphome.config_validation as cv
+
+CONFIG_SCHEMA = cv.invalid(
+    "The esp32_hall component has been removed as of ESPHome 2025.7.0. See https://github.com/esphome/esphome/pull/9117 for details."
+)