* Use analyzers from targeting pack for NetCoreAppCurrent
Fixes that analyzer failures didn't show-up in #74897
Add analyzers to the frameworklist that OOB projects in src/libraries
use, and only auto ProjectReference the analyzers in generators.targets
when not using the analyzers from the targeting pack.
Also move the generator projects related code into a separate file.
Continuation of https://github.com/dotnet/runtime/pull/75093
* Fix project build
* Add missing reference to Regex tests
* Add missing generators for netfx build
* Fix paht in test project
* Fix typo
* Disable runtime marshalling for SharedTypes.csproj
* Disable runtime marshalling for NativeExports.csproj