Delete hub cloud datasets properly in tests

[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

[codecov]

Codecov Report

Merging #1494 (97d00be) into main (d34ca60) will increase coverage by 0.70%.
The diff coverage is 97.06%.

@@            Coverage Diff             @@
##             main    #1494      +/-   ##
==========================================
+ Coverage   91.14%   91.85%   +0.70%     
==========================================
  Files         185      185              
  Lines       15282    15903     +621     
==========================================
+ Hits        13929    14607     +678     
+ Misses       1353     1296      -57     

Flag	Coverage Δ
unittests	91.85% <97.06%> (+0.70%)	⬆️

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

Impacted Files	Coverage Δ
hub/core/fast_forwarding.py	67.24% <0.00%> (+0.57%)	⬆️
hub/core/tiling/sample_tiles.py	100.00% <ø> (ø)
hub/core/tiling/serialize.py	100.00% <ø> (ø)
hub/util/cache_chain.py	84.37% <ø> (ø)
hub/core/query/query.py	84.88% <87.50%> (+2.19%)	⬆️
hub/core/sample.py	88.93% <92.06%> (+1.13%)	⬆️
hub/util/version_control.py	98.50% <94.11%> (+0.45%)	⬆️
hub/util/transform.py	92.50% <94.44%> (+0.42%)	⬆️
hub/util/diff.py	95.71% <95.37%> (-0.74%)	⬇️
hub/core/storage/hub_memory_object.py	95.83% <95.83%> (ø)
... and 91 more

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