fix: Made URL to registry relative, fixes #2731

[creativedutchmen]

Instead of having the URL to the registry be absolute (default to 0.0.0.0:8888), use a relative path. This means there's no SSL issues when putting the UI behind a SSL proxy, nor will it try to load it from localhost. This change allows the UI to be deployed to a central location.

Fixes #2731

[adchia]

/lgtm

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[codecov-commenter]

Codecov Report

Merging #2753 (f114146) into master (0cf3c92) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2753      +/-   ##
==========================================
- Coverage   80.44%   80.40%   -0.04%     
==========================================
  Files         171      171              
  Lines       14571    14571              
==========================================
- Hits        11721    11716       -5     
- Misses       2850     2855       +5     

Flag	Coverage Δ
integrationtests	70.87% <ø> (-0.33%)	⬇️
unittests	59.02% <ø> (ø)

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Impacted Files	Coverage Δ
sdk/python/feast/ui_server.py	23.91% <ø> (ø)
sdk/python/tests/utils/online_read_write_test.py	93.54% <0.00%> (-6.46%)	⬇️
...ion/registration/test_stream_feature_view_apply.py	91.30% <0.00%> (-4.35%)	⬇️
.../integration/online_store/test_online_retrieval.py	96.84% <0.00%> (-3.16%)	⬇️
...ython/feast/embedded_go/online_features_service.py	89.14% <0.00%> (-0.78%)	⬇️
.../integration/offline_store/test_feature_logging.py	100.00% <0.00%> (+4.54%)	⬆️

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