Plugin repo universal tests

[felixwang9817]

What this PR does / why we need it: This PR allows plugin repos to overwrite FULL_REPO_CONFIGS to test against their custom offline/online stores. It also adds the universal pytest marker, to allow plugin repos to easily specify which tests they should run.

Which issue(s) this PR fixes:

Fixes #1892

Does this PR introduce a user-facing change?:

NONE

[felixwang9817]

/kind feature

[codecov-commenter]

Codecov Report

Merging #1946 (cae91d4) into master (cd0e0e0) will decrease coverage by 22.84%.
The diff coverage is 70.00%.

@@             Coverage Diff             @@
##           master    #1946       +/-   ##
===========================================
- Coverage   82.26%   59.41%   -22.85%     
===========================================
  Files          96       96               
  Lines        7669     7698       +29     
===========================================
- Hits         6309     4574     -1735     
- Misses       1360     3124     +1764     

Flag	Coverage Δ
integrationtests	?
unittests	59.41% <70.00%> (+0.03%)	⬆️

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	54.54% <53.84%> (-45.46%)	⬇️
sdk/python/tests/conftest.py	69.44% <62.50%> (-24.31%)	⬇️
sdk/python/feast/constants.py	100.00% <100.00%> (ø)
...python/tests/integration/e2e/test_universal_e2e.py	30.61% <100.00%> (-56.89%)	⬇️
...fline_store/test_universal_historical_retrieval.py	17.73% <100.00%> (-81.56%)	⬇️
.../integration/online_store/test_universal_online.py	14.39% <100.00%> (-84.85%)	⬇️
...istration/test_universal_odfv_feature_inference.py	40.00% <100.00%> (-60.00%)	⬇️
...s/integration/registration/test_universal_types.py	36.73% <100.00%> (-63.27%)	⬇️
.../integration/online_store/test_online_retrieval.py	17.39% <0.00%> (-82.61%)	⬇️
... and 53 more

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[adchia]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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