feat(OCM-Invites): Enable the invitesAcceptedDialog

[mickenordin]

In a previous pr: #51113 the necessary plumbing for OCM Invites was introduced.

Now the companion PR for the contacts is coming along nicely: nextcloud/contacts#4417 and that means that we should now display the inviteAcceptDialog that is provided from the contacts app according to the specification: https://www.ietf.org/archive/id/draft-lopresti-open-cloud-mesh-05.html#name-fields

We can only do that in core, since that is where OCM discovery lives, so here is a PR for that.

TL;DR; If the contacts app has enabled OCM invites, we need to show that in the discovery.

[AndyScherzinger]

/backport to stable32

[ArtificialOwl]

Hello Micke,

with the release of nc32 in few days, I though it would be easier for everyone to make a new PR including your work, and a slightly better way to implements the feature. The idea is to let 'contacts' app to enable the feature and set the correct route to the feature instead of hard written in code:

#55196

I hope you're fine with it !

[mickenordin]

With @ArtificialOwl's patch, this is no longer needed, so closing.

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