Revert "Support inequality syntax for HermitianPSDCone (#3256)"

[blegat]

This reverts commit ac20706.

As mentioned in #3256 (comment), it's an inconsistent behavior with the Symmetric case because when you get dual, you will get a Hermitian matrix while it's not the case for Symmetric.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.93 ⚠️

Comparison is base (b9cf868) 98.11% compared to head (bf6f4ab) 97.19%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3264      +/-   ##
==========================================
- Coverage   98.11%   97.19%   -0.93%     
==========================================
  Files          34       34              
  Lines        4719     4665      -54     
==========================================
- Hits         4630     4534      -96     
- Misses         89      131      +42     

Impacted Files	Coverage Δ
src/sd.jl	99.30% <ø> (-0.70%)	⬇️
src/precompile.jl	0.00% <0.00%> (-100.00%)	⬇️
src/Containers/vectorized_product_iterator.jl	90.90% <0.00%> (-4.55%)	⬇️
src/Containers/DenseAxisArray.jl	93.10% <0.00%> (-2.76%)	⬇️
src/JuMP.jl	95.41% <0.00%> (-1.47%)	⬇️
src/macros.jl	97.27% <0.00%> (-1.31%)	⬇️
src/solution_summary.jl	96.42% <0.00%> (-1.20%)	⬇️
src/aff_expr.jl	96.12% <0.00%> (-1.17%)	⬇️
src/nlp.jl	98.96% <0.00%> (-1.04%)	⬇️
src/Containers/Containers.jl	90.90% <0.00%> (-0.76%)	⬇️
... and 6 more

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[odow]

I misunderstood your comment 😄