2575 improve navigation load time

Related: buyer-experience#2575 (closed)

See notes in issue for initial troubleshooting steps and initial data values of navigation render speed.

What's changing in this MR?

Previously, we were passing down the value of the 6sense API call down two levels of components. This was taking some time and causing multiple navigation component updates. This MR removes the downward flow of data and directly calls the localStorage audience value from the component(s) that have personalized content: navigation-dropdown and navigation-mobile-menu.

This has eliminated one updated() hook and sped up render speeds.

Example data of average navigation rendering speeds:

Original 🐌	New Updates 🚀
Mounted at 8.83ms	Mounted at 11.16ms
Updated at 43.92ms	Updated at 35.26ms
Updated again at 249.15ms	N/A

About 250ms for our nav in prod to finish loading. This MR has everything done at ~35ms!