Remove uses of VariantContextSetBuilder in all unit tests

[kstromhaug]

No description provided.

[codecov-commenter]

Codecov Report

Merging #819 (c67871d) into main (bb36b51) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #819      +/-   ##
==========================================
- Coverage   95.58%   95.56%   -0.03%     
==========================================
  Files         122      122              
  Lines        7068     7077       +9     
  Branches      511      472      -39     
==========================================
+ Hits         6756     6763       +7     
- Misses        312      314       +2     

Flag	Coverage Δ
unittests	95.56% <ø> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
.../fulcrumgenomics/umi/ReviewConsensusVariants.scala	95.96% <0.00%> (-1.62%)	⬇️
.../scala/com/fulcrumgenomics/bam/api/SamWriter.scala	100.00% <0.00%> (ø)

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