Upgrade Nextjs 15 (#7588)

* Upgrade e2e test project to Nextjs 15

* Update next.config experimental.serverActions ot be an object

* Remove deprecated option swcMinify from next.config

* Add 'force-static' to nextjs static GET route handler to generate a valid expected firebase.json

* Add _not-found route to expected effective firebase.json and remove hasStaticAppNotFoundComponent check

* Add hasStaticAppNotFoundComponent verification back

* Add hasStaticAppNotFoundComponent verification back

* Skipping partial html files generated due to enabling ppr in Nextjs

* Detect partial html files in build and add them to reasonsForBackend.
- Move common logic to utils functions

* Add tests cases for new utils functions

* Check if file .html exists before trying to read it.

* Remove warning if file does not exist

* Changelog

* Promise.all test isPartialHTML

* Refactor to use .meta files for PPR

* Changelog

* Upgrade NextJS deploy test to 15.0.0-canary.202 and add new headers for revalidation times

* Bump nextjs to 15.0.0

* Fix identation on package.json for tests

* Update supportedRange constant and skip sharp as dep when next gte 15.0.0

* Changelog

* Fix case for PPR message

* Revert skip sharp on next 15

* Update changelog

* Update image optimization comment.

CHANGELOG.md

@@ -0,0 +1 @@
+- Added support for Next.js 15. (#7588)

scripts/webframeworks-deploy-tests/nextjs/app/app/api/static/route.ts

@@ -1,3 +1,5 @@
+export const dynamic = 'force-static'
+
 export async function GET() {
   return new Response(JSON.stringify([1, 2, 3]), {
     status: 200,

scripts/webframeworks-deploy-tests/nextjs/next.config.js

@@ -1,9 +1,8 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
   reactStrictMode: true,
-  swcMinify: true,
   experimental: {
-    serverActions: true,
+    serverActions: {},
   },
   basePath: "/base",
   i18n: {