Allow the icu native code to be linked out when invariant globalization is enabled...

Allow the icu native code to be linked out when invariant globalization is enabled. (#48120)

* Disable the dynamic loading of icu functions on WASM.

* Preserve GetICUVersion using a DynamicDependency attribute so its only preserved for the tests which need it.

* Add GetICUVersion to .LibraryBuild.xml so its retained during the class libs build.

* Set InvariantGlobalization based on WasmInvariantGlobalization.

* Fix the framework build.

* Avoid linking in the libicu libraries on wasm in invariant mode.

* Move ICU tests dependency to libraries build descriptor file

* Hook up the shared file in the build

* Fix conditionals.

* Remove WasmInvariantGlobalization msbuild variable.

Co-authored-by: Marek Safar <marek.safar@gmail.com>