Consistent Naming Suffix for L3 Site Maps

Site maps currently use a standardized naming suffix for certain map types, such as '_L2' for Layer 2 maps and '_Nbr' for Neighbor maps, but the L3 map for a site does not receive a corresponding distinguishing suffix. This enhancement would add a consistent '_L3' suffix to L3 site maps, aligning the naming convention across all map types generated for a site. Providing this consistency would help customers quickly identify map types when navigating between multiple site maps, reducing confusion and improving overall usability.