Rename CampaignPlan to PatchSet & ChangesetPlan to Patch
Created by: mrnugget
And:
- "src campaign plan create-from-patches" to "src campaign patchset create-from-patches"
- "src action exec -create-plan" to "src action exec -create-patchset"
- "src action exec -force-create-plan" to "src action exec -force-create-patchset"
Part of sourcegraph/sourcegraph#9106 and required change after https://github.com/sourcegraph/sourcegraph/pull/9196