Add better catch for XS and TS tag detection from CRAM

[cmdcolin]

Fixes #2737

The sashimi arc drawing was using feature.get('tags').XS as a fallback for CRAM (CRAM does not use feature.get('XS')), but it didn't take into account that this would be undefined in BAM files. The getTag helper function already helps with this

[codecov]

Codecov Report

Merging #2738 (57bcfd6) into main (40eb4d7) will increase coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #2738      +/-   ##
==========================================
+ Coverage   60.77%   60.79%   +0.02%     
==========================================
  Files         561      561              
  Lines       26333    26330       -3     
  Branches     6417     6414       -3     
==========================================
+ Hits        16004    16008       +4     
+ Misses      10003     9996       -7     
  Partials      326      326              

Impacted Files	Coverage Δ
...ments/src/SNPCoverageAdapter/SNPCoverageAdapter.ts	57.22% <0.00%> (+1.01%)	⬆️
...ckages/core/pluggableElementTypes/RpcMethodType.ts	83.33% <0.00%> (-2.09%)	⬇️
.../linear-genome-view/src/LinearGenomeView/index.tsx	83.94% <0.00%> (+0.16%)	⬆️
...inearGenomeView/components/RefNameAutocomplete.tsx	80.80% <0.00%> (+3.03%)	⬆️
packages/core/TextSearch/TextSearchManager.ts	100.00% <0.00%> (+3.44%)	⬆️

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