Sort status checks to group failures first

[Copilot]

Status checks in the PR overview are displayed in arbitrary order, requiring users to scroll through all checks to find failures. GitHub's web UI groups failing checks at the top for quick identification.

Changes

• Sort status checks by state in StatusCheckDetails component
  • Order: Failure → Pending → Neutral → Success → Unknown
  • Added CHECK_STATE_ORDER constant for consistent sort priority

const CHECK_STATE_ORDER: Record<CheckState, number> = {
	[CheckState.Failure]: 0,
	[CheckState.Pending]: 1,
	[CheckState.Neutral]: 2,
	[CheckState.Success]: 3,
	[CheckState.Unknown]: 4,
};

const StatusCheckDetails = ({ statuses }: { statuses: PullRequestCheckStatus[] }) => {
	const sortedStatuses = [...statuses].sort((a, b) => {
		return CHECK_STATE_ORDER[a.state] - CHECK_STATE_ORDER[b.state];
	});
	// ... render sortedStatuses
};

This matches the GitHub web experience where failing checks are grouped together at the top.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add failing checks together like in the website</issue_title> <issue_description>Testing microsoft/vscode-pull-request-github#7424

I love the PR experience in the editor! One of the things I missed from the website was that it groups the failing checks together:

It would be nice if the in editor experience also grouped them, so I didn't have to scroll through the checks to find the missing ones:

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes microsoft/vscode-pull-request-github#7449

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