fix(oc-dialog): Get rid of the overlay

[susnux]

• Resolves: [Bug]: Spamming the "delete account" button or the "disconnect all devices and delete local data" create multiples screens on top of each other #44487
• Resolves: [Bug]: delete account screen doesn't block the functionality behind it #44488

Summary

• Increment Z-index of oc-dialog-dim
• Increment z-index of oc-dialog
• Insert oc-dialog-dim before oc-dialog

Screencast

After:

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[susnux]

/backport to stable29

[emoral435]

This works, but is this issue not a good contender to replace with NcDialog?

[emoral435]

From what I see, this functionality can be all wrapped into a custom button generated by NcDialog -> https://github.com/nextcloud/server/blob/ff2100a4e515988d3ba44c7cfe734d19a6b4b377/apps/settings/src/components/Users/UserRow.vue#L538C7-L545C10 , but again, this still works :)

[susnux]

/compile

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