Code coverage drop after Ubuntu migration

[alexsavulescu]

Need to see why we've "lost" ~ 1% given the migration to Ubuntu22 in #1946. Went with Ubuntu 22 because for Ubuntu20 it was a bit more:

Codecov Report

Merging #1946 (91559fe) into master (fd29175) will decrease coverage by 1.22%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1946      +/-   ##
==========================================
- Coverage   47.33%   46.11%   -1.23%     
==========================================
  Files         543      514      -29     
  Lines      112603   116496    +3893     
==========================================
+ Hits        53306    53727     +421     
- Misses      59297    62769    +3472     

[Codecov](https://codecov.io/gh/neuronsimulator/nrn/pull/1946?src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) Report Merging [#1946](https://codecov.io/gh/neuronsimulator/nrn/pull/1946?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) (91559fe) into [master](https://codecov.io/gh/neuronsimulator/nrn/commit/fd291750c5d5d36f2b2ecd6925b8db3853deb5c6?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) (fd29175) will decrease coverage by 1.22%. The diff coverage is n/a.

@@ Coverage Diff @@

master #1946 +/-

==========================================

• Coverage 47.33% 46.11% -1.23%
  ========================================== Files 543 514 -29
  Lines 112603 116496 +3893
  ==========================================

• Hits 53306 53727 +421

• Misses 59297 62769 +3472
  Impacted Files Coverage Δ src/gnu/LogNorm.cpp 0.00% <0.00%> (-33.34%) arrow_down src/gnu/Weibull.cpp 0.00% <0.00%> (-33.34%) arrow_down src/gnu/Geom.cpp 0.00% <0.00%> (-25.00%) arrow_down src/gnu/HypGeom.cpp 0.00% <0.00%> (-25.00%) arrow_down src/gnu/Erlang.cpp 0.00% <0.00%> (-16.67%) arrow_down src/gnu/Binomial.cpp 0.00% <0.00%> (-14.29%) arrow_down src/nrnoc/nrnnemo.cpp 0.00% <0.00%> (-14.29%) arrow_down src/ivos/OS/string.h 16.66% <0.00%> (-13.34%) arrow_down src/ivoc/graph.h 0.00% <0.00%> (-12.50%) arrow_down src/sparse/bksub.cpp 0.00% <0.00%> (-12.50%) arrow_down ... and 432 more

Impacted Files	Coverage Δ
src/gnu/LogNorm.cpp	0.00% <0.00%> (-33.34%)
src/gnu/Weibull.cpp	0.00% <0.00%> (-33.34%)
src/gnu/Geom.cpp	0.00% <0.00%> (-25.00%)
src/gnu/HypGeom.cpp	0.00% <0.00%> (-25.00%)
src/gnu/Erlang.cpp	0.00% <0.00%> (-16.67%)
src/gnu/Binomial.cpp	0.00% <0.00%> (-14.29%)
src/nrnoc/nrnnemo.cpp	0.00% <0.00%> (-14.29%)
src/ivos/OS/string.h	16.66% <0.00%> (-13.34%)
src/ivoc/graph.h	0.00% <0.00%> (-12.50%)
src/sparse/bksub.cpp	0.00% <0.00%> (-12.50%)
... and 432 more