Applying campaign results in temporary "errored" status for all PRs

Created by: evanweible-wf

• Sourcegraph version: 3.21.2
• Platform information:

Steps to reproduce:

1. Used src campaigns apply on a campaign with published: true
2. Opened the campaign in the Sourcegraph UI
3. All PRs showed an "Errored" status with the following error:

Creating changeset: error in GraphQL response: was submitted too quickly

4. After a minute or two, I refreshed and they were all fine.

Expected behavior:

I wouldn't expect the "errored" status unless they actually failed. Or maybe they did fail and were retried automatically? Either way, the user experience was momentarily confusing.