DT-6313, DT-6301, DT-6294 refactor bike+transit itinerary rendering

This PR refactors itinerary rendering code related to taking bike to public transit. Some misc refactoring and bug fixes are included ,too.

bike + transit was controlled by large number of confusing and overlapping config options, now only one (bikeBoardingModes) is needed
bike + transit notification code is now simple and easy to understand
WALK mode removed from transit mode array and related utils. It was never needed anywhere and only added a need to erase it from the query parameters.
missing translations related to bike + transit added, unused strings removed (DT-6294, DT-6313)
bugs related to walking bike to / from vehicle fixed (DT-6301)
walk leg is no longer forced when biking (or scooting or driving) ends to a stop
itinerary views no longer re-render after every 30 s, because time is no longer fetched from timestore
weather query no longer crashes if user removes time from url
varous dead components and code removed

HSLdevcom / digitransit-ui