TRD: Better Handling of Value Syncing

[StephenRiosDev]

Came about from PR: https://github.com/AlaskaAirlines/auro-formkit/pull/1233/files

As you can see from this PR, we were running into an issue where we weren't waiting for the values to be sync'd between the internal auro-input and the parent component in auro-combobox and auro-datepicker.

This is a common paradigm in our components where we implement our own components internally and share reactive property names between them that need to stay in sync, and certain operations to be performed when this syncing occurs.

This discussion is to establish a pattern that all developers agree to follow when implementing this paradigm, or updating a component to follow this paradigm.