Duplicate displaynames cause problems in Dropdown

[moreamazingnick]

Describe the bug

Duplicate displaynames cause problems in Dropdown

To Reproduce

Example file

### Business Process Config File ###
#
# Owner           : nicolas
# AddToMenu       : yes
# Statetype       : soft
#
###################################

Storage1 = 
display 0;Storage1;Storage

Database1 = Storage1
display 1;Database1;Database
Storage2 = 
display 0;Storage2;Storage

Webserver = Storage2
display 1;Webserver;Webserver

1. Create a BP with duplicate Service Displaynames (example file)
2. Try to add Storage to another Process
3. Can't differentiate which is which

Expected behavior

Render unique indetifier too for example in brackets

Screenshots

Your Environment

Include as many relevant details about the environment you experienced the problem in

• Icinga Web 2 version and modules (System - About): 2.12.1
• Business Process 2.5.0
• Web browser used: Chrome

[moreamazingnick]

what about this output?