Attempt to fix over-keen restarter.

The restarter will restart jobs that were canceled by a newer change,
causing the new and old change to fight it out.

This change attempts to address this by treating the "canceled" message
as an error.

Author: EricWF

.github/workflows/libcxx-restart-preempted-jobs.yaml

@@ -32,7 +32,7 @@ jobs:
         uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea #v7.0.1
         with:
           script: |
-            const failure_regex = /Process completed with exit code 1./
+            const failure_regex = /(Process completed with exit code 1.)|(Canceling since a higher priority waiting request)/
             const preemption_regex = /(The runner has received a shutdown signal)|(The operation was canceled)/
 
             const wf_run = context.payload.workflow_run
@@ -167,7 +167,7 @@ jobs:
         uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea #v7.0.1
         with:
           script: |
-            const FAILURE_REGEX = /Process completed with exit code 1./
+            const FAILURE_REGEX = /(Process completed with exit code 1.)|(Canceling since a higher priority waiting request)/
             const PREEMPTION_REGEX = /(The runner has received a shutdown signal)|(The operation was canceled)/
 
             function log(msg) {