chore: add account summary table

[mnkiefer]

• Adds a clearer and more actionable summary of flagged accounts, including a markdown table with key statistics for each account.

[Copilot]

Pull request overview

Adds a compact per-account activity summary table to the Bot Detection workflow’s GitHub Step Summary to make triage faster without needing to open the created/updated alert issue.

Changes:

• Introduces a helper to render a markdown table summarizing account age and open/closed Issues/PRs plus comment counts.
• Enhances the “no open items” path to include the same summary table in the Step Summary.
• Adds Step Summary status lines when the workflow creates/updates the alert issue (including label-failure paths), and appends the summary table after alerting.

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[Copilot]

buildAccountSummaryTable scans data.issues and data.prs twice each (open + closed) via separate filter(...) calls. This is unnecessary work and can become noticeably slower if an account has many items; consider counting states in a single pass (e.g., one loop/reduce) per collection.

Suggested change

	const openIssues = (data.issues || []).filter(i => i.state === 'open').length;
	const closedIssues = (data.issues || []).filter(i => i.state === 'closed').length;
	const openPRs = (data.prs || []).filter(p => p.state === 'open').length;
	const closedPRs = (data.prs || []).filter(p => p.state === 'closed').length;
	const issues = data.issues || [];
	let openIssues = 0;
	let closedIssues = 0;
	for (const i of issues) {
	if (i.state === 'open') {
	openIssues++;
	} else if (i.state === 'closed') {
	closedIssues++;
	}
	}
	const prs = data.prs || [];
	let openPRs = 0;
	let closedPRs = 0;
	for (const p of prs) {
	if (p.state === 'open') {
	openPRs++;
	} else if (p.state === 'closed') {
	closedPRs++;
	}
	}