tests: pull tests from https://src.fedoraproject.org/tests/libomp

Related: rhbz#2118319

tests/build-gating.fmf

@@ -18,6 +18,10 @@ adjust:
       and trigger != build
     enabled: false
 
+  - because: "libomp is not supported in s390x"
+    enabled: false
+    when: arch == s390x
+
   # Unfortunately, TMT does not support more declarative approach, we need to run commands on our own.
   - because: "On RHEL, CRB must be enabled to provide rarer packages"
     when: >-
@@ -39,12 +43,12 @@ adjust:
 discover:
     - name: libomp-upstream-tests
       how: fmf
-      url: https://src.fedoraproject.org/rpms/libomp.git
-      ref: rawhide
+      url: https://src.fedoraproject.org/tests/libomp.git
+      ref: main
     - name: upstream-llvm-integration-testsuite
       how: fmf
-      url: https://src.fedoraproject.org/rpms/llvm.git
-      ref: rawhide
+      url: https://src.fedoraproject.org/tests/llvm.git
+      ref: main
       test: integration-test-suite
 execute:
     how: tmt