Allow parameter constraints that involve `FixedParameter`s

[Balandat]

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Summary: Currently, we error out in validate_constraint_parameters if the list of parameters invovles at least one FixedParameter. That doensn't make a lot of sense, we should allow constraints as long as not ALL parameters are FixedParameters.

Differential Revision: D75958304

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D75958304

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.88%. Comparing base (8b01aef) to head (83b407e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3868   +/-   ##
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  Coverage   95.88%   95.88%           
=======================================
  Files         556      556           
  Lines       54987    54995    +8     
=======================================
+ Hits        52725    52733    +8     
  Misses       2262     2262           

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