Fix#38519
When `ENABLE_ACME` renew fails during startup (e.g. CA unreachable),
`ManageSync` currently aborts even if a still-valid certificate is on
disk, so HTTPS never comes up.
If `CacheManagedCertificate` finds a non-expired cert, log the manage
error, continue with that cert, and kick `ManageAsync` for background
retries. First-time install / expired-or-missing cert still fails
closed.
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Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>