chore: Prepare release of stable version 8.0.0

[susnux]

We need to create the stable release before Thursday so apps can update for the feature freeze of Nextcloud 28.

Currently still open feature pull requests:

• fix: Do not depend on uncompiled vue files as dependencies #4777 ( @susnux )
• feat(NcActions): focus the first action again if no action have a focus after render #4775 ( @skjnldsv )
• feat: introduce useIsMobile and useIsFullscreen composables #4761 ( @ShGKme )
• feat(NcActionButton): Allow pressed state on NcActionButton - similar to NcButton #4744 ( @susnux )
• feat(NcColorPicker): palette now can have color names #4611 ( @ShGKme )
• fix(NcInputField): Bring input field height to 44px and fixes its focus feedback #4718 ( @marcoambrosini ) (visually breaking)
• feat(NcRichText) add support of GFM (extended markdown) #4365 ( @Antreesy )
• Better readability of long file and event names #4194 ( @Jerome-Herbinet ) (visually breaking)

Pull requests we can also merge for the first patch release:

• fix(NcModal): Adjust aria-label of close button #4778 ( @susnux )
• fix(NcAppNavigation): Ensure --app-navigation-padding is set also on app-content #4776 ( @susnux )
• Fix input field trailing button alignment #4770 ( @marcoambrosini )
• fix(NcAppNavigation): add focus trap on mobile and improve a11y #4633 ( @ShGKme )
• fix(NcTimezonePicker): Add correct aria-label #4762 ( @susnux )
• fix checkbox sizing #4760 ( @szaimen )
• fix(NcAppNavigation): small screen support #4767 ( @ShGKme )
• fix(NcAppNavigation): remove background square connecting toggle and navigation #4779 ( @ShGKme )

[ShGKme]

Currently still open feature pull requests:

But most of them have no breaking change, so we can release them as 8.1 versions anyway, right?

[susnux]

Yes we can do so, I just hoped to get #4777 in as this breaks js tests in apps.

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I prepare the change log now.