Add THREADS backend build to CI

[streeve]

Renames backends in GHA to make this easier

[streeve]

Needs fix: https://github.com/kokkos/kokkos/pull/5109 Once that's merged we can run with develop only

[dalg24]

How is it related to this CI build?

[streeve]

Our Threads failures are not just in CI, but any run with multiple threads with a parallel_reduce. @masterleinad mentioned a fix, but maybe I linked the wrong PR

[dalg24]

No that would be the one you are correct But unless you have hwloc or specify the number of threads we were using only one thread

[codecov[bot]]

Codecov Report

Merging #537 (58d77ad) into master (a0e1690) will not change coverage. The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #537   +/-   ##
======================================
  Coverage    94.7%   94.7%           
======================================
  Files          44      44           
  Lines        5401    5401           
======================================
  Hits         5120    5120           
  Misses        281     281           

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[streeve]

Develop now works with my local build of core library only, but now Threads compilation fails for Cajita parallel reductions with tags

[masterleinad]

Develop now works with my local build of core library only, but now Threads compilation fails for Cajita parallel reductions with tags

I'll have a look.

[masterleinad]

https://github.com/kokkos/kokkos/pull/5123 provides a fix.

[streeve]

Thanks, @masterleinad