[display] Use register_apply_condition for display.is_displaying_page (#19705)

tests/components/ssd1306_i2c/common-actions.yaml

@@ -0,0 +1,16 @@
+button:
+  - platform: template
+    name: Page check
+    on_press:
+      - if:
+          condition:
+            display.is_displaying_page: ssd1306_i2c_page1
+          then:
+            - logger.log: On page 1
+      - if:
+          condition:
+            display.is_displaying_page:
+              id: ssd1306_i2c_ssd1306_i2c_display
+              page_id: ssd1306_i2c_page2
+          then:
+            - logger.log: On page 2

tests/components/ssd1306_i2c/test-actions.esp8266-ard.yaml

@@ -0,0 +1,7 @@
+substitutions:
+  reset_pin: GPIO2
+
+packages:
+  i2c: !include ../../test_build_components/common/i2c/esp8266-ard.yaml
+  ssd1306_i2c: !include common.yaml
+  actions: !include common-actions.yaml