`*Pool.stop()` should reset the requests to power manager before stopping

### What's needed?

Even after a battery_pool, etc is stopped, its request to the PowerManager would still remain for 60 seconds, which it shouldn't.  The stop method should call `propose_power(None)` to achieve this.

### Proposed solution

_No response_

### Use cases

_No response_

### Alternatives and workarounds

_No response_

### Additional context

_No response_