Add one more redirect to finalize login on the GSS slave

[mickenordin]

This patch will move final login steps back to slave so we can use all login related events on the slave, mostly to enable mfa logins.

[github-actions]

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[ArtificialOwl]

code looks good, i will run some test on my side;
please fix reported syntax issue in the meanwhile !

[mickenordin]

I think that addressed all of the feedback?

[mickenordin]

@ArtificialOwl what is the status of this? Both the stepupauth[0] app and mfazones[1] app are nearing completion, but will not work with gss without this patchset.

0. https://apps.nextcloud.com/apps/stepupauth
1. https://apps.nextcloud.com/apps/mfazones1