Fix: plugin loader cache not matching on decoupled plugin paths (#108529)

* fix(plugins): match decoupled plugin path in fe plugin loader cache

* chore(devenv): update local_cdn to work with latest changes in core

* refactor(plugins): improve legibility by splitting regexs into two

* revert(devenv): revert -oss removal in local_cdn rewrite path

devenv/local_cdn/default.conf

@@ -19,6 +19,6 @@ server {
 		add_header 'Access-Control-Allow-Headers' '*' always;
 		add_header 'Access-Control-Allow-Credentials' 'true' always;
 
-		rewrite ^/grafana-oss/11.4.0-pre/public(.*)$ $1 last;
+		rewrite ^/grafana-oss/12.1.0-pre/public(.*)$ $1 last;
 	}
 }

public/app/features/plugins/loader/cache.ts

@@ -54,7 +54,20 @@ export function getPluginFromCache(path: string): CachedPlugin | undefined {
 export function extractCacheKeyFromPath(path: string) {
   const regex = /\/?public\/plugins\/([^\/]+)\//;
   const match = path.match(regex);
-  return match ? match[1] : null;
+
+  if (match) {
+    return match[1];
+  }
+
+  // Decoupled core plugins can be loaded by alternative paths
+  const decoupledPluginRegex = /\/?public\/app\/plugins\/(?:datasource|panel)\/([^\/]+)\//;
+  const decoupledPluginMatch = path.match(decoupledPluginRegex);
+
+  if (decoupledPluginMatch) {
+    return decoupledPluginMatch[1];
+  }
+
+  return null;
 }
 
 function getCacheKey(address: string): string | undefined {