Move VMR cloaking rules to repositories

[premun]

Context

Currently, the cloaking rules used by the VMR synchronization are in dotnet/installer from where they are synchronized into the VMR. Once we switch onto the flat flow, installer will not be a central piece in the synchronization anymore and we will have to decentralize this. The rules should be in a file in each repository.

Goal

• Define where and how we will store the synchronization rule in every repo
• Add appropriate instructions to the VMR/repo contract
• Adjust the synchronization tooling to use the repository definitions
• Move cloaking rules to all of the repositories
• Remove source-mappings.json