feat: Add possibility to define feature_store.yaml path with env variable

[arcabucero]

Signed-off-by: arcabucero [email protected]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

[arcabucero]

/assign @woop

[codecov-commenter]

Codecov Report

Base: 67.48% // Head: 58.18% // Decreases project coverage by -9.30% :warning:

Coverage data is based on head (5c3a6a0) compared to base (e117082). Patch coverage: 85.71% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3231      +/-   ##
==========================================
- Coverage   67.48%   58.18%   -9.31%     
==========================================
  Files         179      213      +34     
  Lines       16370    17845    +1475     
==========================================
- Hits        11048    10383     -665     
- Misses       5322     7462    +2140     

Flag	Coverage Δ
integrationtests	?
unittests	58.18% <85.71%> (?)

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

Impacted Files	Coverage Δ
sdk/python/feast/cli.py	38.77% <ø> (ø)
sdk/python/feast/feature_store.py	67.68% <ø> (-14.33%)	:arrow_down:
sdk/python/feast/infra/aws.py	22.01% <50.00%> (-3.94%)	:arrow_down:
sdk/python/feast/utils.py	85.43% <75.00%> (-7.20%)	:arrow_down:
sdk/python/feast/constants.py	100.00% <100.00%> (ø)
sdk/python/tests/unit/cli/test_cli.py	100.00% <100.00%> (+80.30%)	:arrow_up:
...sts/integration/registration/test_universal_cli.py	20.20% <0.00%> (-79.80%)	:arrow_down:
...ts/integration/offline_store/test_offline_write.py	26.08% <0.00%> (-73.92%)	:arrow_down:
...fline_store/test_universal_historical_retrieval.py	28.75% <0.00%> (-71.25%)	:arrow_down:
...ests/integration/e2e/test_python_feature_server.py	29.50% <0.00%> (-70.50%)	:arrow_down:
... and 173 more

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[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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