Refactor GetOrCreateEndpointCommand to ObtainEndpointCommand

Replaced `GetOrCreateEndpointCommand` with `ObtainEndpointCommand`
to improve clarity and align with naming conventions. Removed
`GetOrCreateEndpointCommand` and its handler, and introduced
`ObtainEndpointCommand` with equivalent functionality.

Updated `MappingProfile.cs` to map `ObtainEndpointCommand` to
`Endpoint`. Refactored `CreateRecActionCommand.cs` to use the
new `ObtainEndpointCommand` for retrieving or creating `Endpoint`
entities.

These changes ensure consistent naming and maintain the same
behavior while improving code readability.

src/ReC.Application/Endpoints/MappingProfile.cs

@@ -7,6 +7,6 @@ public class MappingProfile : AutoMapper.Profile
 {
     public MappingProfile()
     {
-        CreateMap<GetOrCreateEndpointCommand, Endpoint>();
+        CreateMap<ObtainEndpointCommand, Endpoint>();
     }
 }