[voice_assistant] Use register_apply_condition for is_running and connected (#19703)

tests/components/voice_assistant/common-actions.yaml

@@ -0,0 +1,14 @@
+button:
+  - platform: template
+    name: Voice assistant state
+    on_press:
+      - if:
+          condition:
+            voice_assistant.is_running:
+          then:
+            - logger.log: Running
+      - if:
+          condition:
+            voice_assistant.connected:
+          then:
+            - logger.log: Connected

tests/components/voice_assistant/test-actions.esp32-idf.yaml

@@ -0,0 +1,9 @@
+substitutions:
+  i2s_din_pin: GPIO34
+  i2s_din_pin2: GPIO35
+  i2s_dout_pin: GPIO32
+
+packages:
+  i2s_audio: !include ../../test_build_components/common/i2s_audio/esp32-idf.yaml
+  voice_assistant: !include common-idf.yaml
+  actions: !include common-actions.yaml