Fix mixed emit-multi+/- sessions#18465
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Fixes: #18441
The issue is caused because multi-emit+ and multi-emit- use the same name for the assembly: multi-emit- uses a dynamic assembly named FSIASSEMBLY and multi-emit+ uses multiple memory assemblies named FSIASSEMBLY with a new version for each submission.
When a type can't be found the magic resolver does a simple name search on assemblies looking for the missing type and finds the dynamic assembly.
The fix is to use a different assembly name for multi and single.