[Vercel Serverless] update to include trace and span ID remappers (#2721)

* update to include trace and span ID remappers

* fix tests

* fix tests

* fix tests

---------

Co-authored-by: clifordshelton <cliford.shelton@datadoghq.com>

Author: shaimr-dd

vercel/assets/logs/vercel.yaml

@@ -107,6 +107,16 @@ pipeline:
       enabled: true
       sources:
         - proxy.timestamp
+    - type: trace-id-remapper
+      name: Define `traceId` as the official trace ID of the log
+      enabled: true
+      sources:
+        - traceId
+    - type: span-id-remapper
+      name: Define `spanId` as the official span ID of the log
+      enabled: true
+      sources:
+        - spanId
 metrics:
   - name: vercel.functions.invocations
     query: source:vercel @source:lambda REPORT

vercel/assets/logs/vercel_tests.yaml

@@ -22,7 +22,9 @@ tests:
       "message" : "START RequestId: 85ea8a46-d63e-4fe3-ad03-ade7c16cd36b Version: $LATEST END RequestId: 85ea8a46-d63e-4fe3-ad03-ade7c16cd36b REPORT RequestId: 85ea8a46-d63e-4fe3-ad03-ade7c16cd36b Duration: 0.58 ms Billed Duration: 1 ms Memory Size: 1024 MB Max Memory Used: 31 MB",
       "projectId" : "prj_WTsCRsCir3qyRE9iijJyTc7PqywW",
       "timestamp" : "2021-08-24T15:43:17.812Z",
-      "tags" : [ "source:vercel" ]
+      "tags" : [ "source:vercel" ],
+      "traceId" : "85ea8a46-d63e-4fe3-ad03-ade7c16cd36b",
+      "spanId": "1012381427123789198737891237891"
     }
   result:
     custom:
@@ -64,4 +66,6 @@ tests:
     tags:
      - "source:LOGS_SOURCE"
     timestamp: 1629819797810
+    trace_id: "85ea8a46-d63e-4fe3-ad03-ade7c16cd36b"
+    span_id: "1012381427123789198737891237891"