make number of homotopy steps configurable in SEBO

[sdaulton]

Summary: Candidate generation with SEBO can take a vary long time. We can speed it up by reducing the number of homotopy steps.

Reviewed By: dme65

Differential Revision: D66180580

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This pull request was exported from Phabricator. Differential Revision: D66180580

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 95.72%. Comparing base (7b671dc) to head (5ca3b48).

Files with missing lines	Patch %	Lines
ax/models/torch/botorch_modular/surrogate.py	94.66%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3084 +/- ## ========================================== + Coverage 95.69% 95.72% +0.02% ========================================== Files 488 488 Lines 49510 49685 +175 ========================================== + Hits 47381 47562 +181 + Misses 2129 2123 -6 ```

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[facebook-github-bot]

This pull request has been merged in facebook/Ax@b64420bb3753c36cad9cf643856d043bca5d6870.