Ignore test implementation from coverage being not interesting

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

packages/technical-features/messaging/agnostic/src/features/unit-testing/test-doubles.injectable.ts

@@ -6,6 +6,7 @@ import { getInjectable } from "@ogre-tools/injectable";
 
 export const sendMessageToChannelStubInjectable = getInjectable({
   id: "send-message-to-channel-stub",
+  /* c8 ignore next */
   instantiate: () => () => {},
   injectionToken: sendMessageToChannelInjectionToken,
 });