[TT-15354]: Improve logging in JWT Middleware (#7528) · TykTechnologies/tyk@71eec19

Error return value of `json.Unmarshal` is not checked (errcheck)

Error return value is not checked (errcheck)

Error return value of `json.Unmarshal` is not checked (errcheck)

Error return value of `json.Marshal` is not checked (errcheck)

Error return value of `json.Unmarshal` is not checked (errcheck)

Error return value of `def.InsertIntoAPIDefinitionAsVersion` is not checked (errcheck)

Error return value of `s.InsertIntoAPIDefinitionAsVersion` is not checked (errcheck)

Error return value of `json.Unmarshal` is not checked (errcheck)

Error return value of `base64.StdEncoding.DecodeString` is not checked (errcheck)

Error return value of `json.Marshal` is not checked (errcheck)

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