Fix #2761: make java Enum coder deterministic

[regadas]

Fixes #2761
Closes #2763

[codecov]

Codecov Report

Merging #2764 into master will decrease coverage by 1.62%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #2764      +/-   ##
=========================================
- Coverage   72.13%   70.5%   -1.63%     
=========================================
  Files         215     215              
  Lines        7396    7398       +2     
  Branches      313     365      +52     
=========================================
- Hits         5335    5216     -119     
- Misses       2061    2182     +121

Impacted Files	Coverage Δ
...com/spotify/scio/coders/instances/JavaCoders.scala	88.57% <100%> (+0.69%)	⬆️
...scala/com/spotify/scio/bigquery/client/Cache.scala	0% <0%> (-74.08%)	⬇️
.../spotify/scio/bigquery/BigQueryPartitionUtil.scala	0% <0%> (-52.5%)	⬇️
.../spotify/scio/bigquery/client/BigQueryConfig.scala	0% <0%> (-47.06%)	⬇️
.../scala/com/spotify/scio/bigquery/StorageUtil.scala	0% <0%> (-36.85%)	⬇️
...otify/scio/bigquery/syntax/ScioContextSyntax.scala	16.66% <0%> (-36.12%)	⬇️
...com/spotify/scio/bigquery/types/BigQueryType.scala	58.33% <0%> (-29.17%)	⬇️
...com/spotify/scio/bigquery/types/TypeProvider.scala	52.11% <0%> (-22.54%)	⬇️
...la/com/spotify/scio/bigquery/client/BigQuery.scala	28.2% <0%> (-10.26%)	⬇️
...la/com/spotify/scio/bigquery/client/TableOps.scala	0% <0%> (-10.11%)	⬇️
... and 4 more

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