fix: update workspace form fields when switching templates

[Kira-Pilot]

resolves #1716

The fix took 10 minutes; trying to write a test took a lot longer and I finally gave up. How the heck do you switch the input in an MUI TextField?

Given a TextField with inputProps={{ "data-testid": "template-select" }}

Something like:

renderWithAuth(<CreateWorkspacePage />, {
  route: "/workspaces/new",
  path: "/workspaces/new",
})

const field = await screen.findByTestId("template-select")
expect(field).toBeInTheDocument()

fireEvent.change(field, { target: { value: MockTemplate.id } })
expect(field.value).toBe(MockTemplate.id)

seems to work - everything passes - but schema description text just doesn't show up, even with everything mocked out.
Also, is there a reason we aren't using MUI Select? IDK if that would make this any easier; just curious.