Remove file loader & its test

[tsotnet]

Signed-off-by: Tsotne Tabidze tsotne@tecton.ai

What this PR does / why we need it: Removes file loader & its test because they aren't used anymore and the tests are breaking because of it.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #1632 (8ad1bd5) into master (008a9ea) will increase coverage by 5.67%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1632      +/-   ##
==========================================
+ Coverage   77.61%   83.28%   +5.67%     
==========================================
  Files          66       65       -1     
  Lines        5789     5815      +26     
==========================================
+ Hits         4493     4843     +350     
+ Misses       1296      972     -324     

Flag	Coverage Δ
integrationtests	83.19% <ø> (?)
unittests	76.81% <ø> (-0.80%)	⬇️

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

Impacted Files	Coverage Δ
sdk/python/feast/staging/storage_client.py	36.86% <0.00%> (-15.66%)	⬇️
sdk/python/feast/infra/gcp.py	83.60% <0.00%> (ø)
sdk/python/feast/feature_store.py	92.95% <0.00%> (+0.88%)	⬆️
sdk/python/feast/repo_config.py	95.37% <0.00%> (+0.92%)	⬆️
sdk/python/feast/type_map.py	42.65% <0.00%> (+1.39%)	⬆️
sdk/python/feast/infra/provider.py	83.62% <0.00%> (+2.58%)	⬆️
sdk/python/feast/errors.py	65.78% <0.00%> (+2.63%)	⬆️
sdk/python/tests/conftest.py	100.00% <0.00%> (+3.22%)	⬆️
sdk/python/feast/data_source.py	78.77% <0.00%> (+9.64%)	⬆️
sdk/python/feast/registry.py	80.00% <0.00%> (+18.33%)	⬆️
... and 7 more

---

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[achals]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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