cleanup: cmake compute features

[dbolduc]

We diligently passed along the exact compute_* services that were enabled in the enable string.... but nothing consumed this information.

So remove some of the special compute handling.

For backwards compatibility reasons, we need to keep building compute if any of the compute_* features are requested. Emit a warning in this case that explains that compute is all or nothing.

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.27%. Comparing base (47b5bc2) to head (933278e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14794   +/-   ##
=======================================
  Coverage   93.27%   93.27%           
=======================================
  Files        2319     2319           
  Lines      208231   208231           
=======================================
+ Hits       194224   194237   +13     
+ Misses      14007    13994   -13     

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