Remove toEither from ScioUtil

[regadas]

No description provided.

[codecov]

Codecov Report

Merging #2799 into 0.9.x will decrease coverage by 1.68%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            0.9.x    #2799      +/-   ##
==========================================
- Coverage   72.20%   70.52%   -1.69%     
==========================================
  Files         220      220              
  Lines        7481     7478       -3     
  Branches      337      329       -8     
==========================================
- Hits         5402     5274     -128     
- Misses       2079     2204     +125     

Impacted Files	Coverage Δ
...rc/main/scala/com/spotify/scio/util/ScioUtil.scala	69.56% <ø> (-2.44%)	⬇️
...-sql/src/main/scala/com/spotify/scio/sql/Sql.scala	85.07% <ø> (-0.22%)	⬇️
...in/scala/com/spotify/scio/values/SCollection.scala	90.86% <100.00%> (ø)
...scala/com/spotify/scio/bigquery/client/Cache.scala	0.00% <0.00%> (-74.08%)	⬇️
.../spotify/scio/bigquery/BigQueryPartitionUtil.scala	0.00% <0.00%> (-52.50%)	⬇️
.../spotify/scio/bigquery/client/BigQueryConfig.scala	0.00% <0.00%> (-47.06%)	⬇️
.../scala/com/spotify/scio/bigquery/StorageUtil.scala	0.00% <0.00%> (-36.85%)	⬇️
...otify/scio/bigquery/syntax/ScioContextSyntax.scala	16.66% <0.00%> (-36.12%)	⬇️
...com/spotify/scio/bigquery/types/BigQueryType.scala	58.33% <0.00%> (-29.17%)	⬇️
...com/spotify/scio/bigquery/types/TypeProvider.scala	52.11% <0.00%> (-22.54%)	⬇️
... and 5 more

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