[ci] Fix flash memory overflow on tests (#16587)

tests/components/bluetooth_proxy/test.esp32-c6-idf.yaml

@@ -1,6 +1,8 @@
 <<: !include common.yaml
 
 esp32_ble_tracker:
+
+esp32_ble:
   max_connections: 9
 
 bluetooth_proxy:

tests/test_build_components/build_components_base.esp32-c6-idf.yaml

@@ -4,6 +4,7 @@ esphome:
 
 esp32:
   board: esp32-c6-devkitc-1
+  flash_size: 8MB
   framework:
     type: esp-idf