Better error in SelfService when user\'s institution is not on the whitelist

[phavekes]

This issue is imported from pivotal - Originaly created at Mar 11, 2020 by Pieter van der Meulen

Trying to login to SelfService (3.1.0) with an account from an institution that is not on the whitelist gives a generic oops error:

Mar 11 10:52:16 test-app stepup-selfservice[8660]: {"channel":"app","level":"CRITICAL","message":"Uncaught PHP Exception Surfnet\\StepupSelfService\\SelfServiceBundle\\Exception\\RuntimeException: \"Exception when saving Identity \"d7fdf42f-a5f9-407d-b1f8-02fb6febdd4f\": with command \"Surfnet\\StepupMiddlewareClientBundle\\Identity\\Command\\CreateIdentityCommand\", error: \"Symfony\\Component\\HttpKernel\\Exception\\AccessDeniedHttpException: Institution \"institution-c.nl\" is not on the whitelist and actor \"\" is not an SRAA, processing of command denied\"\" at /opt/stepup/Stepup-SelfService-3.1.0-20200123094957Z-899924d0139418958a9e502aa52eeea34494053d/src/Surfnet/StepupSelfService/SelfServiceBundle/Service/IdentityService.php line 218","context":{"exception":{"class":"Surfnet\\StepupSelfService\\SelfServiceBundle\\Exception\\RuntimeException","message":"Exception when saving Identity \"d7fdf42f-a5f9-407d-b1f8-02fb6febdd4f\": with command \"Surfnet\\StepupMiddlewareClientBundle\\Identity\\Command\\CreateIdentityCommand\", error: \"Symfony\\Component\\HttpKernel\\Exception\\AccessDeniedHttpException: Institution \"institution-c.nl\" is not on the whitelist and actor \"\" is not an SRAA, processing of command denied\"","code":0,"file":"/opt/stepup/Stepup-SelfService-3.1.0-20200123094957Z-899924d0139418958a9e502aa52eeea34494053d/src/Surfnet/StepupSelfService/SelfServiceBundle/Service/IdentityService.php:218"}},"extra":{"art":"38645","server":"sa.test2.surfconext.nl","application":"self-service","request_id":"e085e162478df36c9886c07f39ce5885"}}

Provide a specific error for this case: "Your institution is not authorised to use this service."