Consolidate simple confirmation dialogs into a common reusable pattern

We have roughly 8 confirmation dialogs that all do the same thing: show a title, a warning message, and confirm/cancel buttons. Each is its own component file with its own template, despite being functionally identical.

## Dialogs in scope

* `ConfirmApplicationDeleteDialog` (`pages/application/Settings/dialogs/`)
* `ConfirmInstanceDeleteDialog` (`pages/instance/Settings/dialogs/`)
* `ConfirmDeviceDeleteDialog` (`pages/device/Settings/dialogs/`)
* `ConfirmTeamDeleteDialog` (`pages/team/dialogs/`)
* `ConfirmTeamSuspendDialog` (`pages/team/dialogs/`)
* `ConfirmTeamUserRemoveDialog` (`pages/team/dialogs/`)
* `ConfirmTeamManualBillingDialog` (`pages/team/dialogs/`)
* `ConfirmAdminGrantDialog` (`pages/admin/Users/dialogs/`)

## What should happen

* These should not need custom components at all. Most can be replaced with a direct `Dialog.show()` call passing the title and message text.
* For cases where we still want a lightweight shared component (e.g. a confirmation dialog that asks the user to type a name to confirm deletion), create a common namespace at `components/dialogs/common/` for these reusable dialog content components.
* Remove the individual confirmation dialog files once migrated.

Part of #8122.