[bluetooth_connection] Explicit pairing for rp2 (#18166)

tests/components/bluetooth_connection/__init__.py

@@ -0,0 +1,18 @@
+import esphome.codegen as cg
+from tests.testing_helpers import ComponentManifestOverride
+
+
+def override_manifest(manifest: ComponentManifestOverride) -> None:
+    # close_service_batch compiles only under BLUETOOTH_CONNECTION_HAS_GATT;
+    # emit the backend define so the host build exercises it.
+    async def to_code_testing(config):
+        # These defines are global to the merged host test binary; safe
+        # because no co-compiled test observes them.
+        cg.add_define("USE_BLE_GATT_CLIENT")
+        cg.add_define("USE_BLUETOOTH_PROXY")
+        cg.add_define("BLUETOOTH_PROXY_ADVERTISEMENT_BATCH_SIZE", 16)
+        cg.add_define("BLUETOOTH_PROXY_MAX_CONNECTIONS", 1)
+
+    manifest.to_code = to_code_testing
+    # The batcher sizes api protobuf messages.
+    manifest.dependencies = manifest.dependencies + ["api"]