docs(upload): update stories to csf3 for Upload component

[ncruz-av]

Before submitting a pull request, please make sure the following is done:

1. Fork the repository and create your branch from master.
2. Run yarn in the repository root.
3. If you've fixed a bug or added code that should be tested, add tests!
4. Ensure the test suite passes (yarn test). Tip: yarn test --watch TestName is helpful in development.
5. Make sure your code passed the conventional commits check. Read more about conventional commits

[codecov[bot]]

Codecov Report

Merging #1349 (7ddb4cc) into master (4c31aeb) will decrease coverage by 8.70%. Report is 12 commits behind head on master. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1349      +/-   ##
==========================================
- Coverage   92.81%   84.12%   -8.70%     
==========================================
  Files          29        8      -21     
  Lines        1169      296     -873     
  Branches      355       67     -288     
==========================================
- Hits         1085      249     -836     
+ Misses         84       47      -37     

see 21 files with indirect coverage changes