[CI] Do Not Consider a Job Failed if Steps Were Skipped

This patch makes it so that skipped steps do not cause a job to be
considered failed. The windows premerge jobs currently skip the
build/test step if there are no projects to build/test. These show up as
failures in the dashboard even though everything executed perfectly
fine.

Reviewers: lnihlen, Keenuts

Reviewed By: lnihlen

Pull Request: llvm#127279

Author: boomanaiden154

.ci/metrics/metrics.py

@@ -177,7 +177,7 @@ def get_per_workflow_metrics(
                 # longer in a testing state and we can directly assert the workflow
                 # result.
                 for step in workflow_job.steps:
-                    if step.conclusion != "success":
+                    if step.conclusion != "success" and step.conclusion != "skipped":
                         job_result = 0
                         break