[composablekernel] fix failure status (#4351)

## Motivation

Pipelines were failing on Math CI status check.

## Technical Details

For the success case, we just changed the config in Jenkins to use a
proper app token and no code changes were required. However, the failure
case would not have worked as coded, so we needed to move that outside
of the `rocmnode()` block.

## Test Plan

I removed all of the CI in one of the commits to quickly test, and then
added it back.  Got a successful "success" message and "failure" message
produced

Jenkinsfile

@@ -1965,10 +1965,10 @@ pipeline {
                          description: 'All checks have passed'
         }
         failure {
+            githubNotify context: 'Math CI Summary',
+                         status: 'FAILURE',
+                         description: 'Some checks have failed'
             node(rocmnode("nogpu")) {
-                githubNotify context: 'Math CI Summary',
-                             status: 'FAILURE',
-                             description: 'Some checks have failed'
                 script {
                     sendFailureNotifications()
                 }