Update otel test assertions and pages span_name (#84393)

This updates our otel tests to remove extra span assertions from `next
start` with edge runtime that can cause confusion and fixes a couple
span_names for pages handlers.

x-ref:
#75416 (comment)

Author: ijjk

packages/next/src/server/route-modules/pages/pages-handler.ts

@@ -400,7 +400,7 @@ export const getHandler = ({
                     })
                     span.updateName(name)
                   } else {
-                    span.updateName(`${method} ${req.url}`)
+                    span.updateName(`${method} ${srcPage}`)
                   }
                 })
             } catch (err: unknown) {
@@ -722,7 +722,7 @@ export const getHandler = ({
           tracer.trace(
             BaseServerSpan.handleRequest,
             {
-              spanName: `${method} ${req.url}`,
+              spanName: `${method} ${srcPage}`,
               kind: SpanKind.SERVER,
               attributes: {
                 'http.method': method,

packages/next/src/server/web/adapter.ts

@@ -252,7 +252,7 @@ export async function adapter(
       return getTracer().trace(
         MiddlewareSpan.execute,
         {
-          spanName: `middleware ${request.method} ${request.nextUrl.pathname}`,
+          spanName: `middleware ${request.method}`,
           attributes: {
             'http.target': request.nextUrl.pathname,
             'http.method': request.method,