roachprod/opentelemetry: add new INSPECT job metrics to DRT clusters

This patch adds the following metrics to DRT clusters:
* jobs.inspect.issues_found
* jobs.inspect.runs
* jobs.inspect.runs_with_issues

These metrics were added to the server in #154525 and to the
managed-service DataDog configuration in cockroachlabs/managed-service#22127.

Informs: #153884

Release note: None
Epic: CRDB-30356

Author: spilchen

pkg/roachprod/opentelemetry/cockroachdb_metrics.go

@@ -824,6 +824,9 @@ var cockroachdbMetrics = map[string]string{
 	"jobs_import_rollback_resume_completed":                               "jobs.import_rollback.resume_completed",
 	"jobs_import_rollback_resume_failed":                                  "jobs.import_rollback.resume_failed",
 	"jobs_import_rollback_resume_retry_error":                             "jobs.import_rollback.resume_retry_error",
+	"jobs_inspect_issues_found":                                           "jobs.inspect.issues_found",
+	"jobs_inspect_runs":                                                   "jobs.inspect.runs",
+	"jobs_inspect_runs_with_issues":                                       "jobs.inspect.runs_with_issues",
 	"jobs_key_visualizer_currently_idle":                                  "jobs.key_visualizer.currently_idle",
 	"jobs_key_visualizer_currently_paused":                                "jobs.key_visualizer.currently_paused",
 	"jobs_key_visualizer_currently_running":                               "jobs.key_visualizer.currently_running",