Restrict ldiv! rules to Cholesky

[devmotion]

I noticed that the ldiv! rules added in #1220 also support Array arguments (or Const etc. of Arrays). However, no such primal methods exist in LinearAlgebra:

julia> using LinearAlgebra

julia> methods(ldiv!, Tuple{Array, Any})
# 0 methods for generic function "ldiv!" from LinearAlgebra

There exist a few methods for AbstractMatrix subtypes such as Diagonal but I think it might be best to just restrict the rule to Cholesky for now (also in line with the docstring of ldiv! which tells users that "The argument A should not be a matrix. Rather, instead of matrices it should be a factorization object").

Additionally, the PR fixes a call to the primal in the reverse rule which did not forward the kwargs... correctly.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (3095a4f) 74.66% compared to head (888d47c) 74.93%.

Files	Patch %	Lines
src/internal_rules.jl	83.33%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1257      +/-   ##
==========================================
+ Coverage   74.66%   74.93%   +0.26%     
==========================================
  Files          34       35       +1     
  Lines       10300    10310      +10     
==========================================
+ Hits         7691     7726      +35     
+ Misses       2609     2584      -25     

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