Fix smoke test for SEBO tutorial

[saitcakmak]

For the AxClient parts, this was returning noise levels but using SingleTaskGP, which doesn't accept train_Yvar. Leaving the model type as None should dispatch the correct model type.

Test Plan: https://github.com/facebook/Ax/actions/runs/6117752845

[facebook-github-bot]

@saitcakmak has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.01% ⚠️

Comparison is base (3a0669d) 94.57% compared to head (23428e3) 94.56%.

❗ Current head 23428e3 differs from pull request most recent head ec15515. Consider uploading reports for the commit ec15515 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1826      +/-   ##
==========================================
- Coverage   94.57%   94.56%   -0.01%     
==========================================
  Files         456      456              
  Lines       43010    43007       -3     
==========================================
- Hits        40677    40671       -6     
- Misses       2333     2336       +3     

see 6 files with indirect coverage changes

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[Balandat]

makes sense

[facebook-github-bot]

@saitcakmak merged this pull request in 5da3e55.