feat: return if the pop on NavController was successful (#27404)

Issue number: Resolves #27403 

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## What is the current behavior?

NavController.pop() returns `Promise<void>`.

## What is the new behavior?

NavController.pop() returns `Promise<boolean>` propagating success/fail
from underlying outlet.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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