Change: improve handling of sensitive data

[jjnicola]

What:
Change: improve handling of sensitive data
Jira: SC-877

Why:
With this patch, sentitive data, like credential, are hidden when GET scan_id, and delete from the scan config once the scan was started.

How:
Run a scan with, the scan must contain credentials, of course:
curl --verbose --insecure --cert $CLIENT_CERT --cert-type PEM --key $CLIENT_KEY --request POST https://127.0.0.1:3000/scans -H "X-API-KEY: changeme" -d '@/tmp/simple_scan.json' | jq

And get the scan before and after staring it. Credentials shouldn't be shown after the path is applied.
curl --verbose --insecure --cert $CLIENT_CERT --cert-type PEM --key $CLIENT_KEY --request GET https://127.0.0.1:3000/scans/<THE SCAN ID> -H "X-API-KEY: changeme" | jq .

Checklist:

• Tests
• PR merge commit message adjusted

[Kraemii]

I had an alternative idea, by implementing this directly into serde. This can be done, by adding a line like:

#[serde(serialize_with = "crate::censor")]

To the object, that should be hidden and a function like:

fn censor<S, T>(_: &T,serializer: S) -> std::result::Result<S::Ok, S::Error> where S: Serializer {
  serializer.serialize_str("***")
}

In this case we would be able to censor any data, by just adding the serde flag to it