feat: emit an error if the condition return type is not a boolean (#18196)

* feat: emit an error if the condition return type is not a boolean

* panic instead of just emit

Author: pront

src/conditions/vrl.rs

@@ -113,7 +113,7 @@ impl Conditional for Vrl {
         let result = result
             .map(|value| match value {
                 Value::Boolean(boolean) => boolean,
-                _ => false,
+                _ => panic!("VRL condition did not return a boolean type"),
             })
             .unwrap_or_else(|err| {
                 emit!(VrlConditionExecutionError {