chore: fix exports for types (#630)
I’m trying to update Argo Workflows to pull in the changes from
https://github.com/argoproj/argo-ui/pull/614, but Webpack gives a lot of
warnings like this:

WARNING in ./node_modules/argo-ui/src/components/index.ts 32:0-49:23
export 'FormApi' (reexported as 'FormApi') was not found in './form/compat' (possible exports: Checkbox, Form, FormField, NestedForm, Text, TextArea)
 @ ./node_modules/argo-ui/src/index.ts 2:0-29 2:0-29
 @ ./src/cron-workflows/cron-workflow-row.tsx 1:0-43 22:2028-2034
 @ ./src/cron-workflows/cron-workflow-list.tsx 42:0-54 133:8-23
 @ ./src/cron-workflows/cron-workflow-container.tsx 4:0-56 5:208-224
 @ ./src/cron-workflows/index.ts 1:0-66 3:13-34
 @ ./src/app-router.tsx 25:0-45 164:1125-1148
 @ ./src/app.tsx 6:0-41 18:119-128
 @ ./src/index.tsx 4:0-28 8:48-51
I think this is happening because FormApi is a type, so we should be
using a type-only export. To prevent this from happening again, I
enabled
isolatedModules
so tsc will give an error like this:

src/components/index.ts:49:5 - error TS1205: Re-exporting a type when the '--isolatedModules' flag is provided requires using 'export type'.

49     ValidateValuesFunction,
       ~~~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Mason Malone 651224+MasonM@users.noreply.github.com