Skip long-running (timeout-prone) tests on exotic archs

[RudolfWeeber]

No description provided.

[RudolfWeeber]

How can I manually trigger the exotic arch tests for this?

[codecov]

Codecov Report

Merging #2641 into python will decrease coverage by <1%.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           python   #2641   +/-   ##
======================================
- Coverage      79%     79%   -1%     
======================================
  Files         497     497           
  Lines       27105   27105           
======================================
- Hits        21426   21425    -1     
- Misses       5679    5680    +1

Impacted Files	Coverage Δ
src/core/electrostatics_magnetostatics/p3m.cpp	85% <0%> (-1%)	⬇️

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[mkuron]

This is a terrible solution. The tests should be fixed, not skipped.

[KaiSzuttor]

it's an intermediate solution

[RudolfWeeber]

While I understand the discomfort, as long as no PR with a better solution is provided,
this PR aims to resolve an untenable situation keeping most of the tests on uncommen architectures.
Except for coulomb_tuning, all tests exlucded here run in less than 10 seconds on my desktop. P3m_Tuning takes 21 seconds.
So the tests are not inherently over the top in terms of computational effort.

I'll gladly withdraw this PR, if there is an alternative one solving the frequent false-positives.