chore(renovate): open PRs immediately for Netlify packages

[Copilot]

Removes schedule restrictions for @netlify/ scoped packages so PRs are opened immediately when updates are available.

Changes

• Added packageRule matching ^@netlify/ with schedule: ["at any time"] to override inherited schedule constraints
• Rule placed first in packageRules array for precedence

{
  "description": "Open PRs immediately for @netlify/ packages without a schedule",
  "matchPackagePatterns": ["^@netlify/"],
  "schedule": ["at any time"]
}

Affects 17 @netlify/ packages currently in use.

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[github-actions]

📊 Benchmark results

Comparing with e439393

• Dependency count: 1,061 (no change)
• Package size: 355 MB (no change)
• Number of ts-expect-error directives: 355 (no change)