GenEx: Add support for custom transitive compile properties

Teach the `$<TARGET_PROPERTY:...>` generator expression to check for a
new `TRANSITIVE_COMPILE_PROPERTIES` property in the target's link
closure to enable transitive evaluation of named properties through
the link closure, excluding entries guarded by `$<LINK_ONLY:...>`.

Issue: #20416

Source/cmExportBuildFileGenerator.cxx

@@ -152,6 +152,8 @@ bool cmExportBuildFileGenerator::GenerateMainFile(std::ostream& os)
         gte, cmGeneratorExpression::BuildInterface, properties);
     }
     this->PopulateCompatibleInterfaceProperties(gte, properties);
+    this->PopulateCustomTransitiveInterfaceProperties(
+      gte, cmGeneratorExpression::BuildInterface, properties);
 
     this->GenerateInterfaceProperties(gte, os, properties);