a8n: minor UI improvements
Created by: christinaforney
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1. Add field labels to form inputs, so they are visible when there is input text: -
2. Confirm code hosts all use numeric changeset numbers, then make the changeset number input field a number field. -
3. Add helper text below the repo input field to make it clear what is expected as input: "This is the name of the repository in Sourcegraph in {window.location.protocol + window.location.host}/REPOSITORY_NAME"