Do not capture failed Apollo requests for empty GraphQL errors arrays #6194

Description

Failed-request detection in the Apollo 3, 4, and 5 integrations currently checks whether a response body contains an errors array. The current matcher also treats an empty array such as the following as a failure:

{
  "data": {},
  "errors": []
}

This results in false-positive Sentry events. Failed-request events should only be captured when the GraphQL errors array contains at least one entry.

Acceptance criteria

• Responses with an absent or empty errors array do not produce failed-request events.
• Responses with one or more entries in errors continue to produce failed-request events.
• Detection handles normal JSON whitespace and line breaks.
• Existing streaming-response and data-collection behavior remains unchanged.
• Unit tests cover empty and non-empty arrays in Apollo 3, 4, and 5.

Source: #6074 (comment)