[remote_base] Size the receiver lists by the busiest receiver and hoist attach_receiver

tests/component_tests/remote_receiver/config/receiver_with_proxies.yaml

@@ -5,16 +5,18 @@ esp32:
   board: esp32dev
 
 remote_receiver:
-  - id: rcvr
+  - id: rcvr_ir
     pin: GPIO4
+  - id: rcvr_rf
+    pin: GPIO5
 
 infrared:
   - platform: ir_rf_proxy
     name: IR Receiver
-    remote_receiver_id: rcvr
+    remote_receiver_id: rcvr_ir
 
 radio_frequency:
   - platform: ir_rf_proxy
     name: RF Receiver
     frequency: 433.92MHz
-    remote_receiver_id: rcvr
+    remote_receiver_id: rcvr_rf

tests/component_tests/remote_receiver/test_slot_counts.py

@@ -37,8 +37,9 @@ def test_proxy_receivers_count_as_listeners(
     component_config_path: Callable[[str], Path],
 ) -> None:
     generate_main(component_config_path("receiver_with_proxies.yaml"))
-    # infrared and radio_frequency ir_rf_proxy platforms each listen
-    assert get_define_value("REMOTE_BASE_LISTENER_COUNT") == "2"
+    # one proxy entity listens on each of the two receivers; every receiver's list gets the
+    # capacity of the busiest one, so this is the largest per receiver count, not the sum
+    assert get_define_value("REMOTE_BASE_LISTENER_COUNT") == "1"
     assert get_define_value("REMOTE_BASE_DUMPER_COUNT") is None