feat(app): Disable derivatives tab if ToS not accepted

[effigies]

It seems somewhat inconsistent that we tell people how to get derivatives but not raw data if they haven't agreed not to attempt to reidentify participants.

I think this is as simple as my proposed change. Open to arguments if you think this doesn't matter as much.

[codecov]

Codecov Report

Attention: Patch coverage is 22.22222% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 65.25%. Comparing base (a5269a4) to head (1be2211).

Files	Patch %	Lines
...uro-app/src/scripts/dataset/routes/derivatives.tsx	25.00%	6 Missing ⚠️
...pp/src/scripts/dataset/components/DatasetTools.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2994      +/-   ##
==========================================
- Coverage   65.27%   65.25%   -0.02%     
==========================================
  Files         382      382              
  Lines       24594    24603       +9     
  Branches      883      883              
==========================================
+ Hits        16053    16055       +2     
- Misses       8541     8548       +7     

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