Fix to ensure agreement isn't reloaded for each slice of dataset

[AbhinavTuli]

🚀 🚀 Pull Request

Checklist:

• My code follows the style guidelines of this project and the Contributing document
• I have commented my code, particularly in hard-to-understand areas
• I have kept the coverage-rate up
• I have performed a self-review of my own code and resolved any problems
• I have checked to ensure there aren't any other open Pull Requests for the same change
• I have described and made corresponding changes to the relevant documentation
• New and existing unit tests pass locally with my changes

Changes

Ensures that the dataset agreement is only loaded once for each Dataset instance

[codecov]

Codecov Report

Merging #1347 (b9c8532) into main (f8ae4be) will increase coverage by 0.80%.
The diff coverage is 94.73%.

@@            Coverage Diff             @@
##             main    #1347      +/-   ##
==========================================
+ Coverage   90.11%   90.91%   +0.80%     
==========================================
  Files         146      146              
  Lines       10345    10511     +166     
==========================================
+ Hits         9322     9556     +234     
+ Misses       1023      955      -68     

Flag	Coverage Δ
unittests	90.91% <94.73%> (+0.80%)	⬆️

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

Impacted Files	Coverage Δ
hub/core/dataset/hub_cloud_dataset.py	91.78% <93.75%> (+5.34%)	⬆️
hub/api/tests/test_pickle.py	100.00% <100.00%> (ø)
hub/core/dataset/dataset.py	93.47% <100.00%> (+0.14%)	⬆️
hub/cli/commands.py	100.00% <0.00%> (ø)
hub/api/tests/test_json.py	100.00% <0.00%> (ø)
hub/api/tests/test_text.py	100.00% <0.00%> (ø)
hub/tests/cache_fixtures.py	100.00% <0.00%> (ø)
hub/core/storage/provider.py	100.00% <0.00%> (ø)
hub/core/meta/dataset_meta.py	100.00% <0.00%> (ø)
... and 33 more

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