Deserialize JSON in multipart

[cbeauchesne]

Motivation

When the content of a payload is a multipart, each part is exported to a separated file. Though, this file may be a json file. In that situation, having the content directly inside the data will allow to :

• make schema validations
• directly make assertion on the content, without the need to read and load another file

Changes

Before :

      {
        "headers": {
          "Content-Type": "application/gzip",
          "Content-Disposition": "form-data; name=\"file\"; filename=\"symbols_34.json.gz\""
        },
        "system-tests-information": "File exported to a separated file",
        "system-tests-file-path": "logs_debugger_symdb/interfaces/library/files/aa69f5aba727cfc64324b3956098f242_symbols_34.json"
}

After :

      {
        "headers": {
          "Content-Type": "application/gzip",
          "Content-Disposition": "form-data; name=\"file\"; filename=\"symbols_34.json.gz\""
        },
        "system-tests-filename": "symbols_34.json.gz",
        "content": {
          "schema_version": 1,
          "service": "weblog",
          ...
        }
    }

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes (if something not related to your task is failing, you can ignore it)
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner. We're working on refining the codeowners file quickly.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

🚀 Once your PR is reviewed, you can merge it!

🛟 #apm-shared-testing 🛟

Reviewer checklist

• If PR title starts with [<language>], double-check that only <language> is impacted by the change
• No system-tests internal is modified. Otherwise, I have the approval from R&P team
• CI is green, or failing jobs are not related to this change (and you are 100% sure about this statement)
• A docker base image is modified?
  • the relevant build-XXX-image label is present
• A scenario is added (or removed)?
  • Get a review from R&P team

[cbeauchesne]

Note : needed for #3761