web UI: selection of preset within workspace creation page

[dannykopping]

Must show a dropdown of available presets, and hide the params defined by the preset when selected.

[SasSwart]

Status update:
The first iteration of this work is visible in coder/coder#16201.

Components have been added that allow the choice of preset for a template version. Storybook shows that they behave as expected. See the attached screenshot.

We do not yet hide or lock predefined parameters on the form, but choosing a preset does update the value on the form. Switching between presets presents a UX and technical challenge that will require some consideration.

API calls have been written that fetch presets and their parameters from the coderd api. These still need to be tested.