Selects dropdowns should not be clipped by their container elements

When a user expand a select element and a dropdown is shown, the dropdown container should not be clipped by the boundaries of the parent container (this happens in NcActions and NcModal). Initially discussed here https://github.com/nextcloud/notes/issues/1242 | how it is | what it looks like it should be | | --- | --- | |  |  | credits to @poweruser64 for the mockup cc @ShGKme & @susnux 🫶