Revert "Revert "Disable diagnostic service for projects that we know we don't have all information to provide good results.""

Revert "Disable diagnostic service for projects that we know we don't have all information to provide good results."

this should make roslyn to turn off full project diagnostics when intellisense build is failed for the project.

when we detect intellisense build failure, VS should put actionable data in error list detail pane.
also bing search for the issue should work as well if one prefer blogs.

this change also fix some issue on cross language p2p references. before there was case where we fail to connect cross language p2p reference causing a lot of errors.

this change also include bulk diagnostic update events improvement. this should let us to deal better (especially when we clean those up) when there are a lot of diagnostics.

     Background:

     As discussed in the dev team all hands all code under the GitHub dotnet foundation is using a single process for contribution, API review, infrastructure and coding style. The idea is to present a unified view to our customer and give them a single story for contributing to any project under the dotnet foundation.

     https://github.com/dotnet/corefx/wiki/Contributing#c-coding-style

     The coding style transition is automated using a Roslyn based rewrite tool:

     https://github.com/dotnet/codeformatter

     This will be applied in stages across our developer tree. Right now the focus is on the Open directory as this is what is being presented on github. Code owners will be contacted before the transition happens.

     Note: this is a soft style requirement. There are no build errors that come from this change.
 (changeset 1408227)