feat: error hints for Enzyme

[gdalle]

@vchuravy @wsmoses are there other Enzyme errors for which we can provide DI-specific hints to users?

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 97.81%. Comparing base (bb50d0b) to head (20e8be7).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
DifferentiationInterface/test/Back/Enzyme/test.jl	28.57%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #788      +/-   ##
==========================================
- Coverage   97.90%   97.81%   -0.10%     
==========================================
  Files         129      130       +1     
  Lines        7549     7587      +38     
==========================================
+ Hits         7391     7421      +30     
- Misses        158      166       +8     

Flag	Coverage Δ
DI	98.89% <80.00%> (-0.15%)	⬇️
DIT	95.03% <ø> (ø)

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