The basic validation of our NuPkg and SWR files is implemented. There
are sill some hacks on how these files are found (hard coded paths, etc
...) that need to be cleaned up. The basic checks though are in place.

Need to restructure our CI so that we can call build.ps1 from our
test-build-correctness leg not the other way around. This is necessary
as we now examine many other artifacts including NuGet packages.

This updates our NuSpec and SWR files to be compliant with the analysis
we are now running over them.

The runtimes directory needs to be checked in addition to the root
directory. This has the same set of problems with deployed dependencies.

Desktop signing uses a COM call into the CLR to sign an assembly,
which is not available on Mono or CoreCLR. This change always
uses portable signing by default on Mono as well as CoreCLR.

….8-preview1

Merge dev15.7.x to dev15.8-preview1

…o-master

Merge dev15.8-preview1 to master

otherwise, it will pick up IList but Array implementation only support Rank==1 on runtime even if there is no compile time error.

Fix our Compiler NuGet dependency list

This is cleaning up some code needed to bootstrap groovy changes in an
earlier PR:

dotnet#26762

Remove value that is not used in fix all.

Groovy cleanup

No longer require conditional compilation in order to run the full
IOperation test suite.

dotnet/core-eng#3420

Move Spanish image to RS4

Keeping this offline for now until we get to the root of the Spanish
machine issues.

…sure on the pool in highly multithreaded scenarios. (dotnet#26845)

Related to dotnet#26779.

Updates to our IOperation testing

* Simplify how we do fix all tests.

* Simplify.

…otnet#25032)

* Moved VB tests to test emitted attributes vs source synthesized ones

* PR Comments

Updated summaries

dotnet#26857)

* guard us from completely failing when classification type map is messed up.

also add NFW to save dump on such situation

* PR feedbacks and made us to guard from classification issue.

* addressed PR feedback

* PR feedback. add back NFW

…Json