fix: make symbolic_evaluate unwrap everything it returns

[AayushSabharwal]

No description provided.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.03%. Comparing base (e036266) to head (34c1f5e).
Report is 51 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1329       +/-   ##
===========================================
+ Coverage    3.80%   78.03%   +74.23%     
===========================================
  Files          47       48        +1     
  Lines        4602     4771      +169     
===========================================
+ Hits          175     3723     +3548     
+ Misses       4427     1048     -3379     

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[ChrisRackauckas]

Why is this necessary? Test?

[AayushSabharwal]

This was motivated by SciML/SciMLBase.jl#837 (comment). Interestingly, the relevant MTK test passed when the PR was merged. I'm unsure why.