Add "Types" in the issue open modal

### Problem Statement

Basically, GitHub issues have the ability to have "Types" alongside labels, so this is a request to add that into Sentry.

### Solution Brainstorm

Add a type field in the open issue modal.

### Product Area

Issues

The issue identifies the Issues product area and the open issue modal as the entry point, but names no files or tests. Start by tracing that modal and its existing labels flow; done means a type field is available there alongside labels and supports GitHub issue types.

Written by the indexing model from the issue text.