[Small PR] Removes tfds 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

-TFDS tests take up a long time on CI and aren't essential. Removing them for now.
-May cause codecov to drop slightly but should not be an issue.

[codecov]

Codecov Report

Merging #1070 (ddb0f9a) into main (514d690) will decrease coverage by 0.47%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1070      +/-   ##
==========================================
- Coverage   89.99%   89.51%   -0.48%     
==========================================
  Files          95       94       -1     
  Lines        4248     4227      -21     
==========================================
- Hits         3823     3784      -39     
- Misses        425      443      +18     

Impacted Files	Coverage Δ
hub/util/from_tfds.py	0.00% <0.00%> (-100.00%)	⬇️

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