Clear viewed route in nearby view

[amy-corson-ibigroup]

Description:
Cleans up the viewed route in the nearby view so that

• The route overlay is no longer on the map when a user is looking at nearby stops and entities
• Accessing the nearby view via pattern viewer and then clicking the "back" button in the browser will properly re-set the viewed route and zoom the map correctly (previously it would stay in the nearby view map state)

PR Checklist:

• Does the code follow accessibility standards (WCAG 2.1 AA Compliant)?
• Are all languages supported (Internationalization/Localization)?
• Are appropriate Typescript types implemented?

[daniel-heppner-ibigroup]

Let's see if we can find an imperative way to clear the viewed route instead of using a useEffect. Let me know if you want to pair program it.

[daniel-heppner-ibigroup]

Thanks! I like this a lot more than the useeffect

[josh-willis-arcadis]

LGTM!