Realtime stops vectortile layer checks whether there are stoptimes on the service day

[sharhio]

PR Instructions

Summary

A badge needs to be displayed on the map for stops without traffic on the service day. The vectortile layer for realtime stops checks if stop times exist for a particular stop and returns the result.

Issue

• A badge needs to be displayed on the map for stops without traffic on the service day.

Unit tests

• Added the new value to the RealtimeStopsLayerTest.
• Functionality was manually verified.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 68.38%. Comparing base (fe41603) to head (ae3a95a). Report is 41 commits behind head on dev-2.x.

Files	Patch %	Lines
...s/stops/DigitransitRealtimeStopPropertyMapper.java	87.50%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev-2.x #5861 +/- ## ============================================= + Coverage 68.37% 68.38% +0.01% - Complexity 16673 16678 +5 ============================================= Files 1914 1914 Lines 72652 72659 +7 Branches 7452 7452 ============================================= + Hits 49673 49686 +13 + Misses 20422 20416 -6 Partials 2557 2557 ```

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