fix: perun webflow integration

Description

The place of integration of our perun flow to CAS changed to CreateServiceTicket. Attribute mappings and some other stuff can be different for each service(SP) and that wasn't taken into acount before. This should fix it.

How to test

See Testing here.

Author's checklist

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• This MR has been tested or does not change functionality
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Reviewer's checklist

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Other information

When logging directly to IDP(through CAS login) our flow didn't trigger as expected and GeneralSuccesPage for login was displayed. When logging from service it correctly triggered.

EDIT: Just found out that logging directly to CAS can be disabled. More here. If we do disable it, we can asure that our flow will always run. However our flow serves mostly for service integration (AFAIK) so it may not be an issue.

Or we can just change the generic login page to include list/search box of services but that would require more work.

Related issues

re S T R - 1 4 9 4 (Written like this so it doesn't change the status of the original task. No stand-alone task for this was created.)