Registry teardown

[felixwang9817]

What this PR does / why we need it: As of right now, registries do not get cleaned up during teardown. This is especially bad for GCS and S3 registries. This PR ensures that registries get cleaned up during teardown.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #1718 (92c66c6) into master (13645c1) will increase coverage by 0.13%.
The diff coverage is 85.41%.

@@            Coverage Diff             @@
##           master    #1718      +/-   ##
==========================================
+ Coverage   78.66%   78.80%   +0.13%     
==========================================
  Files          77       77              
  Lines        6502     6529      +27     
==========================================
+ Hits         5115     5145      +30     
+ Misses       1387     1384       -3     

Flag	Coverage Δ
integrationtests	78.72% <85.41%> (+0.13%)	⬆️
unittests	62.24% <52.08%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
sdk/python/feast/repo_operations.py	32.50% <33.33%> (+1.43%)	⬆️
sdk/python/feast/registry.py	79.86% <73.68%> (-0.96%)	⬇️
sdk/python/feast/feature_store.py	94.71% <100.00%> (+0.33%)	⬆️
...alization/test_offline_online_store_consistency.py	100.00% <100.00%> (ø)
...gration/offline_store/test_historical_retrieval.py	99.09% <100.00%> (+<0.01%)	⬆️
...sts/integration/registration/test_feature_store.py	100.00% <100.00%> (ø)
...on/tests/integration/registration/test_registry.py	100.00% <100.00%> (ø)

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[felixwang9817]

/retest

[achals]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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