a8n/web: Allow updating the CampaignPlan and other fields of a Campaign
Created by: mrnugget
After https://github.com/sourcegraph/sourcegraph/pull/7328 we need to implement the UI that allows a user to update a Campaign with a new CampaignPlan. See the discussion in #7328 for more details.
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Add a section to the docs at https://docs.sourcegraph.com/user/automation about updating a campaign. Mention all of the kinds of operations that can occur due to an update (start from the bullet list under Proposal in RFC 95 and ask @mrnugget to make sure any other edge cases he considered are mentioned if users would care).