Implemented PostLoginEvent in SAMLController

[x7airworker]

This will also fix #426.

[blizzz]

Tests need adjustments.

Also I just got aware about #851 with different event classes 😕

[x7airworker]

Because I am using a custom user backend, I have no need for the events mentioned in #851 although I agree that they should be implemented. I'll be happy to adjust the test cases if you can point me in the right direction. I am not familiar with writing tests for Nextcloud Apps and especially testing event dispatching, but I'll try my best.

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[x7airworker]

@blizzz Could you take a look at my added test assertions?

[blizzz]

@x7airworker sure, I try to do it this week. Btw, pushing commits do not trigger Github notifications, a comment like yours now is helping catching attention :)

[blizzz]

Tests need adjustments.

Also I just got aware about #851 with different event classes 😕

@x7airworker sorry for bringing this up late. I was checking with the server team, and indeed we have here a duplicated event for whatever reason. The goal is now set to sunset PostLoginEvent in favor of UserLoggedInEvent, which is also consistent with the modern naming of events. Again apologies for the forth-and-back.

Thus is is better to continue with #851 (i have to have a closer look at it still), but the tests would be relevant there just as well.