Throw error when calling rxMethod/signalMethod outside injection context without injector

Which @ngrx/* package(s) are relevant/related to the feature request?

signals

Information

Follow up #5079 by actually throwing an error when calling rxMethod/signalMethod outside injection context without injector

Describe any alternatives/workarounds you're currently using

No response

I would be willing to submit a PR to fix this issue

• Yes
• No