[Fix] Report and exit for unsupported DSP KPAR configuration

[Cstandardlib]

Linked Issue

Fix #6745

What's changed?

• Exit immediately INPUT kpar is not supported on DSP build.
• ONLY kpar == NPROC is permitted.
• Use WARNING_QUIT instead of exit in both KPAR input tests(listed as follows).

Note

• If NPROC > KPAR, this check will find the problem and quit. (Only applicable to DSP)
• If NPROC < KPAR, the program will exit by Parallel_Global::divide_mpi_groups in source/source_base/parallel_global.cpp.

void Parallel_Global::divide_mpi_groups(...)
{
...
    if (procs < num_groups)
    {
        std::cout << "Error: Number of processes (" << procs << ") must be greater than the number of groups ("
                  << num_groups << ")." << std::endl;
        exit(1);
    }

Tests

• Unittests are provided for this case.