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updates tailscale/corp#21823 Misconfigured, broken, or blocked DNS will often present as "internet is broken'" to the end user. This plumbs the health tracker into the dns manager and forwarder and adds a health warning with a 5 second delay that is raised on failures in the forwarder and lowered on successes. Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>