Review limits hitting http responses

[alexey-yarmosh]

Review all instances of limits hitting: like too many probes in one call, per IP, per token, etc. Response should be clear enough to distinguish between all of these cases.

E.g. in case of credit shortage of we are responding with:

429 - {
  "error": {
    "type": "too_many_probes",
    "message": "Too Many Probes Requested"
  },
  "links": {
    "documentation": "https://globalping.io/docs/api.globalping.io#post-/v1/measurements"
  }
}

Which could be interpreted as: "You are asking for too many probes in a single http request".