[Paradise] Add metric label for enum value unsupported local card

Previously when we introduce the enum NOT_OFFERED_USE_UNSUPPORTED_LOCAL_CARD, we forgot to add the label string for the enum value: https://chromium-review.googlesource.com/c/chromium/src/+/1700298

This is a fix for that.

Bug: 954367
Change-Id: I3bba1d4ed4c1879339e8baa54d600a8d319242a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1753050
Commit-Queue: Sujie Zhu <sujiezhu@google.com>
Auto-Submit: Sujie Zhu <sujiezhu@google.com>
Reviewed-by: Jared Saul <jsaul@google.com>
Cr-Commit-Position: refs/heads/master@{#686647}

tools/metrics/histograms/enums.xml

@@ -4082,6 +4082,7 @@ Unknown properties are collapsed to zero. -->
   <int value="5" label="Get upload details RPC failed"/>
   <int value="6" label="All cards are unsupported"/>
   <int value="7" label="Single local card"/>
+  <int value="8" label="User used unsupported local card"/>
 </enum>
 
 <enum name="AutofillLocalCardMigrationDialogOffer">