Convert Form Components to TypeScript

Co-authored-by: Mark McDowall <mark@mcdowall.ca>

Remove defaultProps from TypeScript components

(cherry picked from commit a90c13e86f798841cb6db038bb6b6d1408a00585)

Fix multi-select checkboxes not appearing

(cherry picked from commit e199710c15fbfa643a9f71c7a20f70b1722d0df6)

frontend/typings/jdu.d.ts

@@ -0,0 +1,3 @@
+declare module 'jdu' {
+  export function replace(value: string): string;
+}