fix: only set permament caching header when reading html file when it's not during server initialization AND when read html is Next produced fully static html (#2935)

* chore: adjust pattern for sites->projects rename

* fix: handle case of env not being defined for edge functions

* test: add test cases for unexpected permanent cdn cache control cases

* fix: only set permament caching header when reading html file when its not during server initialization AND when read html is Next produced fully static html

Author: pieh

package-lock.json

@@ -51,6 +51,7 @@
     "@fastly/http-compute-js": "1.1.5",
     "@netlify/blobs": "^8.2.0",
     "@netlify/build": "^32.2.0",
+    "@netlify/config": "^23.0.1",
     "@netlify/edge-bundler": "^13.0.3",
     "@netlify/edge-functions": "^2.12.0",
     "@netlify/eslint-config-node": "^7.0.1",