Update fuzzing infra to build and use the shared framework

[buyaa-n]

Fuzzing infra is currently broken because of #106599, because it is partially integrated with the repo workflow. In order to fix this failure, we need to integrate it completely, that means need to fix #107204:

• Make the fuzzing solution a framework dependent app and use test shared framework
• Fixed and/or suppressed all findings of different analyzer runs
• Updated the README.md to apply the changes made
• Ended up removing nuget.config as it became same as the repo config in the root, also removed Directory.Build.targets that was empty

Further MihuBot need to be updated as needed, might also need to update onefuzz deployment scripts CC @MihaZupan

[MihaZupan]

Thank you

[MihaZupan]

The bot's also working again now MihuBot/runtime-utils@5466698
And updating the pipeline: buyaa-n#19