[stable8] fix(NcModal): use useTrapStackControl for pausing other focus traps

[backportbot]

Backport of #7084

Warning, This backport's changes differ from the original and might be incomplete ⚠️

Todo

• Review and resolve any conflicts
• Amend HEAD commit to remove the line stating to skip CI

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[Antreesy]

Maybe it's another issue 🤔

Steps:
Talk -> Mobile width -> Expand left sidebar -> Open 'New conversation' dialog

In Vue 3:
there is only latest trap in the stack

In Vue 2:
left sidebar trap is paused, but focus is still trapped there. so should remain deactivated as before

[nfebe]

Hello @Antreesy please what is the status of this? There is a bug where NcModal.clearFocusTrap() attempts to reactivate external focus traps no longer have valid DOM containers when cleaning up password dialogs spawned from NcActionInput contexts.

This can be seen in Nextcloud -> accounts -> create new group | rename group

After some spiraling from nextcloud/password-confirmation to nextcloud/dialogs it appears this is the fix which is still absent from the current stable used in nextcloud/server.

[Antreesy]

As written above, same fix isn't working with Vue2
Current state will remove an error coming from password-confirmation library, but break all places with 2+ active focus traps

[susnux]

#7304