Create Scheduler REST endpoint to fetch masked SecHub configuration at SecHub

[de-jcup]

Situation

Sometimes administrators or users wants to know a SecHub configuration for a job. For example to check which kind of scans were configured, which files were excluded etc. But currently there is no dedicated way to handle this.

ℹ️ This is a sub issue of #3250

Wanted

Users and administrators shall be able to fetch a SecHub configuration for a created SecHub job.
But sensitive data shall be masked.

Solution

• introduce new REST endpoint at scheduler domain
• access only for administrators and users of the project
• sensitive data (DAST login and remote data section credentials) must be masked.
• audit log must be implemented