chore: Deprecate request feature views (remove it from tests & go)

[pyalex]

Signed-off-by: pyalex moskalenko.alexey@gmail.com

What this PR does / why we need it:

Deprecate request feature views (remove it from tests & go).

[codecov-commenter]

Codecov Report

Merging #2477 (df45c91) into master (7c19cf7) will decrease coverage by 26.23%.
The diff coverage is 7.14%.

@@             Coverage Diff             @@
##           master    #2477       +/-   ##
===========================================
- Coverage   84.85%   58.62%   -26.24%     
===========================================
  Files         127      126        -1     
  Lines       10918    10842       -76     
===========================================
- Hits         9265     6356     -2909     
- Misses       1653     4486     +2833     

Flag	Coverage Δ
integrationtests	?
unittests	58.62% <7.14%> (+0.04%)	⬆️

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	56.86% <ø> (-39.25%)	⬇️
...tegration/feature_repos/universal/feature_views.py	35.48% <ø> (-49.14%)	⬇️
...fline_store/test_universal_historical_retrieval.py	23.73% <ø> (-76.27%)	⬇️
.../integration/online_store/test_universal_online.py	14.85% <7.14%> (-79.02%)	⬇️
.../integration/online_store/test_online_retrieval.py	17.39% <0.00%> (-82.61%)	⬇️
sdk/python/tests/utils/online_read_write_test.py	20.68% <0.00%> (-79.32%)	⬇️
sdk/python/feast/wait.py	23.52% <0.00%> (-70.59%)	⬇️
sdk/python/feast/infra/online_stores/redis.py	27.04% <0.00%> (-69.19%)	⬇️
... and 68 more

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[adchia]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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