Improved distribution of GPUs when running the testsuite

Description

Improved distribution of GPUs when running the testsuite by keeping track of GPUS in use. Also fixed the case when running with MPI+GPUs, as the script was using the availability of a working mpiexec to decided if how to distribute the GPUs, instead of checking if the code had been compiled with MPI.

News snippet

Improved distribution of GPUs when running the testsuite.

Checklist

• I have checked that my code follows the Octopus coding standards
• I have added tests for all the new features added in this request.

changed milestone to %10.0

added GPU Testsuite labels

Codecov Report

Merging #592 into develop will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           develop    #592   +/-   ##
=======================================
  Coverage       71%     71%           
=======================================
  Files          462     462           
  Lines        87766   87766           
=======================================
  Hits         62320   62320           
  Misses       25446   25446

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mentioned in merge request !587 (merged)

approved this merge request

merged

mentioned in commit 9a97bc1f

added in Changelog label