Code Insights: [FE] Use Monaco query input for insight query field
Created by: vovakulikov
Closes https://github.com/sourcegraph/sourcegraph/issues/21339 Note: this PR is based on https://github.com/sourcegraph/sourcegraph/pull/28101
Context
This PR just adopts MonacoQueryInput for code insights data series field needs and reuses this component in the creation UI form.
Known issues
- Query field doesn't provide good styles for a disabled state (it isn't a big problem cause we're going to allow editing this field on the edit page)
- Suggestions panel doesn't work if we have a multi-line query. It works only on the first line. (I think it's a problem with our suggestions system deep in code intel hook. We will solve this problem later in a separate issue)