Bump @nextcloud/vue to v6.0.0-beta.1

[nickvergessen]

• Popover/Tooltip lib changes and needs adjusting Adjust to changes in Popover component #7639
• Actions can not be manually disabled anymore Disabling and reenabling an Actions component yields a Vue warning #7715
• AppSettingsDialog is broken => Outsourced to Fix app settings dialog nextcloud-libraries/nextcloud-vue#3025

Fix #7639
Fix #7715

[nickvergessen]

Chat input yields a Vue warning:
#7715

[raimund-schluessler]

We had to rename the Button component to ButtonVue for 6.0.0. So all imports need to be adjusted
from

import Button from '@nextcloud/vue/dist/Components/Button'

to

import ButtonVue from '@nextcloud/vue/dist/Components/ButtonVue'

[nickvergessen]

Yeah, we have one last button PR to go in #7647
Then I'll rebase this one and can fix all imports in one go.