Simplify solving of sparse matrix

[alkino]

If we give a matrix to the SparseLU ctor it already analyze and factorize the matrix.
Don't do it twice.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[azure-pipelines]

✔️ 19f63c2 -> Azure artifacts URL

[bbpbuildbot]

Logfiles from GitLab pipeline #179493 (:no_entry:) have been uploaded here!

Status and direct links:

• ✅ mac_m1_cmake_build: [cmake, ON, OFF, OFF, address]
• ✅ spack_setup
• ✅ build:nmodl
• ✅ build:neuron:nmodl:intel:legacy
• ⛔ build:neuron:nmodl:intel:shared
• ✅ build:neuron:nmodl:nvhpc:acc:legacy
• ✅ build:neuron:nmodl:nvhpc:acc:shared
• ✅ build:neuron:nmodl:nvhpc:omp:legacy
• ✅ build:neuron:nmodl:nvhpc:omp
• ✅ test:neuron:nmodl:intel:legacy
• ⏩ test:neuron:nmodl:intel:shared
• ✅ test:neuron:nmodl:nvhpc:acc:legacy
• ✅ test:neuron:nmodl:nvhpc:acc:shared
• ✅ test:neuron:nmodl:nvhpc:omp:legacy
• ✅ test:neuron:nmodl:nvhpc:omp

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b087a92) 66.20% compared to head (19f63c2) 66.20%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2639      +/-   ##
==========================================
- Coverage   66.20%   66.20%   -0.01%     
==========================================
  Files         559      559              
  Lines      108955   108956       +1     
==========================================
- Hits        72132    72130       -2     
- Misses      36823    36826       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.