test: fix flaky network test by normalizing accept-language header (#743)

Author: ergunsh

tests/tools/network.test.js.snapshot

@@ -3,7 +3,7 @@ exports[`network > network_get_request > should get request from previous naviga
 ## Request http://localhost:<port>/one
 Status:  [success - 200]
 ### Request Headers
-- accept-language:en-US,en;q=0.9
+- accept-language:<lang>
 - upgrade-insecure-requests:1
 - user-agent:<user-agent>
 - sec-ch-ua:"Chromium";v="<version>", "Not A(Brand";v="24"

tests/utils.ts

@@ -211,6 +211,10 @@ export function stabilizeResponseOutput(text: unknown) {
 
   const savedSnapshot = /Saved snapshot to (.*)/g;
   output = output.replaceAll(savedSnapshot, 'Saved snapshot to <file>');
+
+  const acceptLanguageRegEx = /accept-language:.*\n/g;
+  output = output.replaceAll(acceptLanguageRegEx, 'accept-language:<lang>\n');
+
   return output;
 }