Feast v0.15.1

Fixed bugs:

• Add missing comma in setup.py #2031 (achals)
• Correct cleanup after usage e2e tests #2015 (pyalex)
• Change Environment timestamps to be in UTC #2007 (felixwang9817)
• ODFV UDFs should handle list types #2002 (Agent007)

Merged pull requests:

• Remove unsupported java parts #2029 (pyalex)
• Fix checked out branch for PR docker image build workflow #2018 (tsotnet)
• Remove duplicates in setup.py and run rudimentary verifications #2016 (achals)
• Upload feature server docker image to ECR on approved PRs #2014 (tsotnet)
• Add integration tests for AWS Lambda feature server #2001 (tsotnet)
• Moving Feast Java back into main repo under java/ package #1997 (adchia)