show proper message when extension is not installed for a connection provider (#19377)

* show extension not installed error

* extension provider mapping

* fix tests

src/sql/platform/capabilities/common/capabilitiesService.ts

@@ -20,6 +20,16 @@ export const clientCapabilities = {
 	hostVersion: HOST_VERSION
 };
 
+/**
+ * The map containing the connection provider names and the owning extensions.
+ * This is to workaround the issue that we don't have the ability to store and query the information from extension gallery.
+ */
+export const ConnectionProviderAndExtensionMap = new Map<string, string>([
+	['PGSQL', 'microsoft.azuredatastudio-postgresql'],
+	['KUSTO', 'microsoft.kusto'],
+	['LOGANALYTICS', 'microsoft.azuremonitor']
+]);
+
 /**
  * The connection string options for connection provider.
  */