fix(rocprofiler-systems): Allow MPI tests to function

[kcossett-amd]

Motivation

Jira ID: AIPROFSYST-524

Note: I'm not enabling these tests to run on TheRock CI. I'm just fixing things so that if someone were to build with THEROCK_ENABLE_MPI, then these tests would pass.

MPI tests were originally disabled as if I build with THEROCK_ENABLE_MPI, then all mpi tests would fail with:

--------------------------------------------------------------------------
Sorry!  You were supposed to get help about:
    prterun-exec-failed
from the file:
    /therock/output/build/third-party/openmpi/build/stage/share/openmpi/help-mpirun.txt: No such file or directory
But I couldn't find that topic in the file.  Sorry!
--------------------------------------------------------------------------

Open MPI bakes its build-time install prefix (/therock/output/... from the manylinux container) into its binaries as string literals. Outside the container that path doesn't exist, so plugin discovery fails (prterun-exec-failed) and even the error message can't be looked up (help-mpirun.txt: No such file or directory).

Technical Details

Open MPI 5.x is three independently-prefixed layers (OMPI/OPAL, the PRRTE launcher, and PMIx), each with its own override env var. Setting these (OPAL_PREFIX, PRTE_PREFIX, PMIX_PREFIX) to rocm_path (the real install root) relocates every layer's file lookups to where the files actually are.

• Requires fix(rocprofiler-systems): make MPI auto-detection not CWD-dependent rocm-systems#8415

Test Plan

Manual Testing

Test Result

Locally, all tests pass.

100% tests passed, 0 tests failed out of 26

Label Time Summary:
all               =  91.04 sec*proc (24 tests)
baseline          =   2.31 sec*proc (1 test)
binary_rewrite    =  55.56 sec*proc (10 tests)
cleanup           =   0.16 sec*proc (1 test)
full              =  91.04 sec*proc (24 tests)
global            =   0.56 sec*proc (2 tests)
mpi               =  91.04 sec*proc (24 tests)
prerequisite      =   0.41 sec*proc (1 test)
sampling          =  11.26 sec*proc (3 tests)
sys_run           =  21.90 sec*proc (10 tests)

Total Test time (real) =  91.62 sec

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[therock-pr-bot]

✅ All Checks Passed — Ready for Review

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⛔ Forbidden Files	✅ Pass	—
🧪 Unit Test	✅ Pass	PR does not contain code files — Unit Test auto-passed
🔎 pre-commit	✅ Pass	—
🚫 Draft PR	🔜 To Be Enabled	—
🚩 Feature Flag	🔜 To Be Enabled	—
📊 Code Coverage	🔜 To Be Enabled	—
🤖 therock-pr-bot	✅ Pass	—

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[therock-pr-bot]

🎉 All checks passed! This PR is ready for review.