[CI] Consolidate some tests (T) (#8208)

tests/components/tm1621/test.esp8266-ard.yaml

@@ -1,12 +1,7 @@
-display:
-  - platform: tm1621
-    id: tm1621_display
-    cs_pin: 15
-    data_pin: 14
-    read_pin: 12
-    write_pin: 13
-    lambda: |-
-      it.printf(0, "%.1f", 20.0);
-      it.display_celsius(true);
-      it.printf(1, "%.1f", 20.0);
-      it.display_humidity(true);
+substitutions:
+  cs_pin: GPIO15
+  data_pin: GPIO14
+  read_pin: GPIO12
+  write_pin: GPIO13
+
+<<: !include common.yaml