test: cert-checker does not error in integration tests

[jsha]

I noticed that in test/config-next/ca.json we have the modern profile with maxValidityPeriod of 583200s. But that value is not listed in test/config-next/cert-checker.json's acceptableValidityDurations. That means we're not exercising cert-checker, or the modern profile, or both.

To test, I changed acceptableValidityDurations to remove 7776000s. After running ./tn.sh -i, I found that the output included:

# Finished processing certificates, report length: 69, good: 4, bad: 69
{
  "good-certs": 4,
  "bad-certs": 69,
  "db-errs": 0,
  "entries": {
  ...

However, the overall status of the tests was success. We should:

• Ensure cert-checker fails CI when it fails.
• Ensure each of our test profiles is exercised by integration tests (otherwise, why have that profile in CI?).
• Add 583200s to maxValidityPeriod for cert-checker in CI.