[CI] Add OpenMP parallelism parameters to pure MPI jobs

[aobolensk]

close #176 (task 3)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.46%. Comparing base (43905ea) to head (b0ff50a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #211   +/-   ##
=======================================
  Coverage   93.46%   93.46%           
=======================================
  Files          34       34           
  Lines         811      811           
  Branches      226      226           
=======================================
  Hits          758      758           
  Misses          9        9           
  Partials       44       44           

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