Fix README to reflect new integration test suites

[adchia]

What this PR does / why we need it:
We have new java integration tests as well as a new workflow file for the existing integration tests / continuous build. This updates the workflow names and READMEs to reflect these changes.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #2124 (eb3a05c) into master (65c41bd) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2124      +/-   ##
==========================================
+ Coverage   83.45%   83.51%   +0.06%     
==========================================
  Files         100      100              
  Lines        8088     8088              
==========================================
+ Hits         6750     6755       +5     
+ Misses       1338     1333       -5     

Flag	Coverage Δ
integrationtests	73.94% <ø> (+0.04%)	⬆️
unittests	57.99% <ø> (ø)

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

Impacted Files	Coverage Δ
sdk/python/feast/infra/utils/aws_utils.py	84.78% <0.00%> (+1.44%)	⬆️
sdk/python/feast/infra/online_stores/datastore.py	93.70% <0.00%> (+2.36%)	⬆️

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[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [adchia]

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[pyalex]

/lgtm