Add explicit return type linting to some extensions (#19199)

extensions/sql-database-projects/.eslintrc.json

@@ -8,6 +8,8 @@
 			{
 				"ignoreVoid": true
 			}
-		]
+		],
+		// Disabled until the issues can be fixed
+		"@typescript-eslint/explicit-function-return-type": ["off"]
 	}
 }