Prevent false positives for .net development

[JoostVoskuil]

Description:

This PR reduces false positives when it comes to .net development

• Allow .ruleset files (created by SonarQube). This file contains a key= parameter that refers to a SonarQube project Key
• Allow PublicKeyToken regex. The public key token is a unique 16-character key that is given to the assembly when it is built and signed in Microsoft Visual Studio and is not a secret
• Allow InstrumentationKey regex. This is a key used for Azure Application Insights. Is not a secret

Checklist:

• [X] Does your PR pass tests?
• [ ] Have you written new tests for your changes?
• [X] Have you lint your code locally prior to submission?