feat: allow multiple source services for generic propagation

Description

feat: allow multiple source services for generic propagation

• we want to extent the possibility of generic json gen service
• support multiple services configurations in Perun sharing the same destination using generic gen

BREAKING CHANGE: ALL services using generic json gen in combination with slave script need to rename their PRESCRIPT/POSTSCRIPT to match the PERUN service name

How to test

Can be tested on slave playground, setting up two services using generic_json_gen implementation and starting both provisioning at the same time. Prescripts need to match the name of the service in Perun.

Author's checklist

• I have followed the contribution guidelines
• This MR has been tested or does not change functionality
• I have added relevant merge request dependencies (if this MR has any)
• I have added the correct labels
• I have assigned reviewers (if any are relevant)
• I have edited the documentation (if the changes require it) or I have noted the need for the change if I do not have access to the documentation
• I have marked all introduced BREAKING CHANGES or necessary DEPLOYMENT NOTES in the commit message(s)

Reviewer's checklist

• This MR has been tested or does not change functionality
• This MR has correct commit message format

Other information

Related issues

relates to STR-1316