GET /api/v1/vaas error: expected at most one transaction

[agodnic]

Description

When there's more than one VAA with the same transaction hash, the endpoint GET /api/v1/vaas?txHash={hash} returns:

{
  "code": 13,
  "message": "INTERNAL ERROR",
  "details": [
    {
    "request_id": "5822cc4d-3ff0-4046-ac0c-ccffcd3948bc",
    "stack_trace": "expected at most one transaction, but found 2\n"
    }
  ]
}

Instead, it should just return the VAAs.

Example: https://api.staging.wormscan.io/api/v1/vaas/?txHash=bc7f513abbcf749e95aaeeb09733bf99fa07e9e0fbd62863b59fc012a64f9807&parsedPayload=true

[agodnic]

Implemented in #494