Andrew Scott c84642ac16 feat(router): add unmatchedInputBehavior option to componentInputBinding
Introduce a new configuration option `unmatchedInputBehavior` to the `componentInputBinding` feature. This option allows users to configure the behavior when a component input is not matched by any key in the router data.

The available values are:
- 'alwaysUndefined': (Default) Always binds undefined to unmatched inputs.
- 'undefinedIfStale': Binds undefined only if the input was previously available in the router data for the active route in the outlet.

This feature addresses concerns raised in #63835 and #52946 regarding the retention of default values for inputs that were never targeted by the router, while still ensuring that stale data is cleared when a parameter is removed.
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