[Do not merge] v0.15.0

[kellen]

non-draft status for CI

[codecov[bot]]

Codecov Report

:x: Patch coverage is 49.78723% with 118 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 61.35%. Comparing base (a450123) to head (bdc04bd).

Files with missing lines	Patch %	Lines
...n/scala/com/spotify/scio/bigtable/BigTableIO.scala	12.96%	47 Missing :warning:
...scala/com/spotify/scio/datastore/DatastoreIO.scala	19.04%	17 Missing :warning:
...n/scala/com/spotify/scio/bigquery/BigQueryIO.scala	23.80%	16 Missing :warning:
...otify/scio/bigtable/syntax/SCollectionSyntax.scala	27.27%	8 Missing :warning:
...otify/scio/bigtable/syntax/ScioContextSyntax.scala	33.33%	8 Missing :warning:
...io/bigquery/dynamic/syntax/SCollectionSyntax.scala	0.00%	6 Missing :warning:
...scala/com/spotify/scio/tensorflow/TFRecordIO.scala	84.00%	4 Missing :warning:
...in/scala/com/spotify/scio/testing/ScioIOSpec.scala	0.00%	4 Missing :warning:
...main/scala/com/spotify/scio/avro/AvroTypedIO.scala	75.00%	3 Missing :warning:
.../main/scala/com/spotify/scio/avro/ProtobufIO.scala	76.92%	3 Missing :warning:
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5609      +/-   ##
==========================================
- Coverage   61.44%   61.35%   -0.10%     
==========================================
  Files         314      316       +2     
  Lines       11429    11610     +181     
  Branches      812      804       -8     
==========================================
+ Hits         7023     7123     +100     
- Misses       4406     4487      +81     

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