Change Environment timestamps to be in UTC

[felixwang9817]

Signed-off-by: Felix Wang wangfelix98@gmail.com

What this PR does / why we need it: Tests have been failing in PT due to timezone issues. This PR fixes those issues.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[felixwang9817]

/kind bug

[adchia]

/lgtm

[achals]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: achals, adchia, felixwang9817

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[codecov-commenter]

Codecov Report

Merging #2007 (00daf12) into master (d35fe44) will increase coverage by 22.85%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #2007       +/-   ##
===========================================
+ Coverage   60.35%   83.21%   +22.85%     
===========================================
  Files         103      103               
  Lines        8417     8417               
===========================================
+ Hits         5080     7004     +1924     
+ Misses       3337     1413     -1924     

Flag	Coverage Δ
integrationtests	74.37% <ø> (?)
unittests	60.35% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ts/integration/feature_repos/repo_configuration.py	93.82% <ø> (+41.97%)	⬆️
sdk/python/feast/online_response.py	86.79% <0.00%> (+1.88%)	⬆️
sdk/python/feast/infra/online_stores/sqlite.py	96.77% <0.00%> (+2.15%)	⬆️
sdk/python/feast/feature.py	72.72% <0.00%> (+3.03%)	⬆️
sdk/python/feast/repo_config.py	78.97% <0.00%> (+3.97%)	⬆️
sdk/python/feast/infra/provider.py	90.90% <0.00%> (+4.13%)	⬆️
sdk/python/feast/errors.py	70.00% <0.00%> (+5.00%)	⬆️
sdk/python/feast/data_source.py	61.29% <0.00%> (+6.45%)	⬆️
sdk/python/feast/infra/offline_stores/file.py	96.80% <0.00%> (+8.00%)	⬆️
sdk/python/feast/flags_helper.py	90.47% <0.00%> (+9.52%)	⬆️
... and 50 more

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[adchia]

/lgtm

[adchia]

force merged since over two runs of the integration tests, different python versions flaked out each time (but all tests pass at least once over the two runs)