UnitTestFrameworkPkg: Support FILE_GUID override in host based unit tests

UnitTestFrameworkPkg: Support FILE_GUID override in host based unit tests

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4129

Always use the module name with FILE_GUID to generate the host-based
unit test executable image and symbol files.  This allows the same
host-based unit test INF file to be used more than once in a single
DSC file with FILE_GUID override.  This is valuable when there is a
requirement to run the same host-based unit test with different PCD
settings, library mappings, or build options.

Cc: Michael Kubacki <mikuback@linux.microsoft.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Michael Kubacki <mikuback@linux.microsoft.com>
Reviewed-by: Sean Brogan <sean.brogan@microsoft.com>