fix: typing for template props data context (#2754)

makes MgtTemplateProps generic to define the type for dataContext with a default of any type
this provides backwards compatability and allows for specific typing of templates.

Author: gavinbarron

packages/mgt-react/src/MgtTemplateProps.ts

@@ -5,7 +5,9 @@
  * -------------------------------------------------------------------------------------------
  */
 
-export interface MgtTemplateProps {
+// Make type generic with a default of any to provide backwards compatibility and allow correct typing of the dataContext
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export interface MgtTemplateProps<T = any> {
   template?: string;
-  dataContext?: unknown;
+  dataContext?: T;
 }