refactor: stick to supported device types

[romanc]

Description

Following the YAGNI principle, stick to the device types that are actually supported in the codebase. We can add support for other devices later.

@havogt as discussed the other day, let's have a discussion about whether or not we need all these device types defined. I know that @FlorianDeconinck would like to work towards over protection and throwing errors rather sooner than later for unsupported things (very much in general).

This is part of a clean-up series tracked in issue #1880.

Requirements

• All fixes and/or new features come with corresponding tests.
  N/A
• Important design decisions have been documented in the appropriate ADR inside the docs/development/ADRs/ folder.
  N/A

[FlorianDeconinck]

cscs-ci run

[FlorianDeconinck]

So from our side, obviously we aren't anywhere near starting to look at those architectures (to my great dismay). ROCm and CUDA are the only two device. Managed & Pinned will become a mid term subject, but again, not there yet.

[FlorianDeconinck]

cscs-ci run