frontend: `VeryGenericIndicator` configuration is inconsistent

[ES-Alexander]

Current behaviour

1. Variable selection involves clicking a button, typing into a (new, different location) search bar, then selecting options from another separate location
2. Variables are presented by their Cockpit IDs

Expected or desired behaviour

1. Use v-autocomplete, per #1811
2. Use variable names, instead of their IDs

Prerequisites

• [x] I have checked to make sure that a similar request has not already been filed or fixed.