Added a condition in saml test to change the config path

What does this MR do and why?

This MR updates the config path for all the project as to where the simplesamlphp_authsouces.php will be stored.

Not having this change was causing the group-saml test to fail in the MR pipelines of the omnibus-gitlab project. This change should fix it.

Linked issue : #451436 (closed)

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