ConnectionError now properly displays its message

[alexsch01]

supersedes #1762

---

without this PR

ConnectionError: [object Object]

after this PR: example

ConnectionError: [
  {
    "sqlState": "28000",
    "message": "[Microsoft][SQL Server Native Client 11.0][SQL Server]Login failed for user 'FakeUser'.",
    "code": 18456
  },
  {
    "sqlState": "42000",
    "message": "[Microsoft][SQL Server Native Client 11.0][SQL Server]Cannot open database \"FakeDatabase\" requested by the login. The login failed.",
    "code": 4060
  },
  {
    "sqlState": "28000",
    "message": "[Microsoft][SQL Server Native Client 11.0][SQL Server]Login failed for user 'FakeUser'.",
    "code": 18456
  },
  {
    "sqlState": "42000",
    "message": "[Microsoft][SQL Server Native Client 11.0][SQL Server]Cannot open database \"FakeDatabase\" requested by the login. The login failed.",
    "code": 4060
  }
]

[dhensby]

Thanks for this; the CI will fail because the commit messages do not meet the conventional commit standard. Please can you squash the commits and word it something like fix: better rendering of ConnectionError with multiple errors

[alexsch01]

Replaced by #1793