semgrep: add MeasureSinceWithLabels to FSM time rule (#14812)

Metrics state is local to the server and needs to use time, which is normally
forbidden in the FSM code. We have a bypass for this rule for
`metrics.MeasureSince` but needed one for `metrics.MeasureSinceWithLabels` as well.

.semgrep/fsm_time.yml

@@ -7,6 +7,10 @@ rules:
       - pattern-not-inside: |
           defer metrics.MeasureSince(...)
 
+      # Metric state is local to the server and therefore must use time.
+      - pattern-not-inside: |
+          defer metrics.MeasureSinceWithLabels(...)
+
       # The timetable's whole point is to roughly track timestamps for Raft log
       # indexes, so it must use time.
       - pattern-not-inside: |