fix(inputs): Update checkboxes and radios to have proper value attribute (#3196)

Author: Ayesha Mazumdar

ui/components/activity-timeline/__tests__/__snapshots__/Activity_Timeline_Expandable_renders_a_task_timeline_item.json

@@ -30,6 +30,7 @@ export let Checkbox = props => (
       disabled={props.disabled}
       defaultChecked={props.checked}
       id={props.id}
+      value={props.id}
       name="checkbox"
       type="checkbox"
     />

ui/components/activity-timeline/__tests__/__snapshots__/Activity_Timeline_Expandable_renders_a_timeline_item_trigger_with_a_task_checkbox.json

@@ -19,6 +19,7 @@ export let CheckboxAddButton = props => {
         className="slds-assistive-text"
         type="checkbox"
         id={uniqueId}
+        value={uniqueId}
         disabled={props.disabled}
         defaultChecked={props.checked}
         tabIndex={props.tabIndex}

ui/components/activity-timeline/__tests__/__snapshots__/Activity_Timeline_Expandable_renders_a_timeline_item_with_icons.json

@@ -48,6 +48,7 @@ export let FauxLabel = props => (
 export let Checkbox = props => (
   <input
     name={props.uniqueId}
+    value={props.uniqueId}
     type="checkbox"
     disabled={props.disabled}
     defaultChecked={props.checked}