Enhanced email details for HPC project assignments

• In ProjectRequestService.cs, updated the method for handling project requests to include request.Project.ShortName.Value and a new parameter, request.ProjectResourceName, in the email content for new HPC project assignments. This aims to provide more detailed information in the email notifications.
• In ProjectResourceService.cs, modified the ProjectResourceService class to ensure ProviderId is directly obtained from providerGroup.Key without using the null-conditional operator. This change likely improves code clarity and reflects an assumption of non-null providerGroup.Key.