Mark RXD test as skip on Ubuntu 22+

[JCGoran]

This is a workaround, not a fix, for neuronsimulator/nrn-build-ci#66.
To minimize headaches, it shouldn't have any impact on anything other than that one test being marked as skip on Ubuntu 22 and newer.
See for instance https://github.com/neuronsimulator/nrn-build-ci/actions/runs/10955119487/job/30418368871

[azure-pipelines]

✔️ 703ff24 -> Azure artifacts URL

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.39%. Comparing base (1d812c8) to head (b8081dd).
Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3080      +/-   ##
==========================================
+ Coverage   67.27%   67.39%   +0.11%     
==========================================
  Files         571      573       +2     
  Lines      104870   104927      +57     
==========================================
+ Hits        70556    70720     +164     
+ Misses      34314    34207     -107     

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[azure-pipelines]

✔️ 46c4408 -> Azure artifacts URL

[1uc]

Thank you! Remember to add an Issue to investigate further.

[1uc]

Which versions exactly are faulty? In particular is either Ubuntu 22.04 or 22.09 affect?

[JCGoran]

Which versions exactly are faulty? In particular is either Ubuntu 22.04 or 22.09 affect?

At least 22.04 and 24.04 are affected, but not 20.04. I can't say anything about 22.09 since I don't have a Docker image of that one.

[sonarqubecloud]

Quality Gate passed

Issues
0 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 SonarCloud

[azure-pipelines]

✔️ b8081dd -> Azure artifacts URL

[JCGoran]

Along with neuronsimulator/nrn-build-ci#73 we can finally make the build CI green again: https://github.com/neuronsimulator/nrn-build-ci/actions/runs/10995314679