removing sideset bookkeeping stuff from function spaces since this is…

[cmhamel]

… redundant

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.60%. Comparing base (266c78b) to head (44228ee).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #164      +/-   ##
==========================================
+ Coverage   79.47%   80.60%   +1.13%     
==========================================
  Files          44       44              
  Lines        1788     1753      -35     
==========================================
- Hits         1421     1413       -8     
+ Misses        367      340      -27     

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