Chore: Enable useUnknownInCatchVariables for stricter type checking in catch blocks (#50591)

* wrap a bunch of errors

* wrap more things!

* fix up some unit tests

* wrap more errors

* tiny bit of tidy up

public/app/plugins/datasource/loki/querybuilder/parsing.ts

@@ -49,9 +49,11 @@ export function buildVisualQueryFromString(expr: string): Context {
   } catch (err) {
     // Not ideal to log it here, but otherwise we would lose the stack trace.
     console.error(err);
-    context.errors.push({
-      text: err.message,
-    });
+    if (err instanceof Error) {
+      context.errors.push({
+        text: err.message,
+      });
+    }
   }
 
   // If we have empty query, we want to reset errors