Migration of jsx files to tsx 3 (#851)

This is in continue to:
- #850
- #848

The last files should be converted as part of this PR, there are only a
handful left.

src/components/FieldFunction.tsx

@@ -107,7 +107,7 @@ type FieldFunctionProps = {
   fieldName: string
   fieldType: string
   fieldSpec: any
-  errors?: unknown[]
+  errors?: {[key: string]: {message: string}}
   value?: any
 };