Align JSON data between gh pr checks and gh pr view --json statusCheckRollup

[andyfeller]

Overview

During #6056, @nobe4 and I saw that the PR checks data that is available from different commands wasn't in parity with language or even the data available. This is a follow up from that conversation to review and align appropriately if possible:

@nobe4 : Unless there's a specific reason, I think having parity between the two outputs would be better. It seems that the statusCheckRollup is missing bucket, description, and event and has some different names 🤔

gh pr checks --json	gh pr view --json statusCheckRollup
bucket
completedAt	completedAt
description
event
link	detailsUrl
name	name
startedAt	startedAt
state	conclusion
workflow
_	status

Originally posted by @nobe4 in #9079 (comment)