cvode no_cap uses direct backing store instead of Node*

[nrnhines]

This is the latest in a series of PR's and branches that are meant to improve cvode performance to the level of release/8.2
The series is
hines/cvlocal-bug #3299
hines/cell-contiguous #3300
hines/cellcontig+scatter-ptr https://github.com/neuronsimulator/nrn/tree/hines/cellcontig%2Bscatter-ptr
hines/cellcontig-scatter-treemat https://github.com/neuronsimulator/nrn/tree/hines/cellcontig-scatter-treemat
this PR

This PR generally approaches or exceeds the performance of 8.2 (at least for x86_64) with respect to cvode. Ringtest performance is (data copied from #3283 (comment))

nrniv -python ringtest.py -npt 1 -compart 1 3 -nring 32 -rparm -nt 1

x86_64 intel icx
version  fixed  global  local
8.2      1.86   30.5    1.35
master   1.53   56.0    6.67
contig   1.59   60.8    2.76
scatter  1.71   48.4    2.32
treemat  1.61   35.9    2.01
nocap    1.6    25.1    1.78

x86_64 gcc 13.3.0
version  fixed  global  local
8.2          2.92   51.9    2.47
master   2.38   63.4    6.19
contig    2.09   63.6    3.10
scatter   1.98   49.8    2.54
treemat  2.01   38.7    2.25
nocap     2.01   28.4    2.01

There continues to be an issue with Apple M1

Apple M1
version  fixed  global  local
8.2         1.87    23.67   1.32
master  4.1      60.1      5.3
contig    5.0      70.5      4.1
scatter   4.9      64.6      3.8
treemat 4.1      47.5      2.9
nocap    4.9      58.3      3.47
coreneuron 2.0

[sonarqubecloud]

Quality Gate passed

Issues
87 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[azure-pipelines]

✔️ 2123efe -> Azure artifacts URL

[codecov]

Codecov Report

Attention: Patch coverage is 98.91697% with 3 lines in your changes missing coverage. Please review.

Project coverage is 67.12%. Comparing base (90900fa) to head (2123efe).

Files with missing lines	Patch %	Lines
src/nrncvode/netcvode.cpp	95.65%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3314      +/-   ##
==========================================
+ Coverage   67.08%   67.12%   +0.04%     
==========================================
  Files         571      571              
  Lines      111039   111086      +47     
==========================================
+ Hits        74485    74569      +84     
+ Misses      36554    36517      -37     

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