core(audit): added content-signal directive in robots.txt file #16767
      
        
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Summary
Cloudflare recently introduced a
Content-Signalrobots.txt directive so site owners can control which AI crawlers may use their content and how. It already appears on 3.8 millions websites Cloudflare-managed sites, but Lighthouse currently flags it as an “Unknown directive.”This PR updates the robots.txt safelist and its corresponding tests so the directive is recognized.
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Related Issues/PRs
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