Add CorsRegexEnvProcessor and corresponding tests

- Implemented CorsRegexEnvProcessor to build CORS origin regex from a comma-separated host list (ALLOWED_FRONTEND_HOSTS).
- Added tests for CorsRegexEnvProcessor to validate regex generation and matching behavior.
- Created JSON files for AST representation of the new classes and tests.

config/packages/nelmio_cors.yaml

@@ -1,7 +1,7 @@
 nelmio_cors:
     defaults:
         origin_regex: true
-        allow_origin: ['%env(CORS_ALLOW_ORIGIN)%']
+        allow_origin: ['%env(cors_regex:ALLOWED_FRONTEND_HOSTS)%']
         allow_methods: ['GET', 'OPTIONS', 'POST', 'PATCH', 'DELETE']
         allow_headers: ['Content-Type', 'Authorization', 'X-CSRF-Token', 'Content-Disposition']
         expose_headers: ['X-RateLimit-Limit', 'X-RateLimit-Remaining', 'X-RateLimit-Reset']
@@ -9,8 +9,8 @@ nelmio_cors:
         allow_credentials: false
     paths:
         '^/api/':
-            allow_origin: ['%env(CORS_ALLOW_ORIGIN)%']
+            allow_origin: ['%env(cors_regex:ALLOWED_FRONTEND_HOSTS)%']
         '^/oauth/':
-            allow_origin: ['%env(CORS_ALLOW_ORIGIN)%']
+            allow_origin: ['%env(cors_regex:ALLOWED_FRONTEND_HOSTS)%']
         '^/health':
-            allow_origin: ['%env(CORS_ALLOW_ORIGIN)%']
+            allow_origin: ['%env(cors_regex:ALLOWED_FRONTEND_HOSTS)%']