Build corelib as part of libraries build. (#34664)

Build corelib as part of libraries build.  (#34664)

* simplify libraries build dependencies.

* FIx depends for tests

* Fix artifact name for webAssembly

* try building corelib during libraries build.

* small typo

* Merge coreclr+libraries build scripts

* update scripts based on new refactor

* fix script error

* dont build corelib for mono or testbuilds

* Handle webassembly case

* fix allconfigurations build

* remove separate corelib job

* remove corelib jobs from pipelines

* delete build-corelib-job

* PR feedback

* remove special case for webassembly

now that its dependent on the mono runtimeFlavor