Fix build error about trace file and edge route (#50808)

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### What?

Error occurs when processing trace file rules of edge route.

### Why?

Edge routes have no trace files, so we don't need to process exclude and
include rules about it's trace file.

### How?

Fixes #50791

Co-authored-by: JJ Kasper <jj@jjsweb.site>

packages/next/src/build/index.ts

@@ -1770,6 +1770,12 @@ export default async function build(
 
           if (config.outputFileTracing) {
             for (let page of pageKeys.pages) {
+              // edge routes have no trace files
+              const pageInfo = pageInfos.get(page)
+              if (pageInfo?.runtime === 'edge') {
+                continue
+              }
+
               const combinedIncludes = new Set<string>()
               const combinedExcludes = new Set<string>()