Refactor crypto tests

[bugadani]

Splits classic/work-queue tests into separate modules, so that we can properly initialize the drivers instead of the unsafe hackery we've had before - and without the accidental refcount retention issues we've had with the previous solution.

[github-actions]

New commits in main have made this PR unmergeable. Please resolve the conflicts.

[Copilot]

Pull request overview

This PR refactors the crypto HIL tests to better separate concerns between “direct driver” tests and work-queue/back-end tests, reducing per-test boilerplate and removing ad-hoc peripheral acquisition in favor of module #[init] contexts.

Changes:

• Refactored SHA tests by hoisting shared helpers to module scope and splitting SHA work-queue tests into a dedicated work_queue_tests module with its own Context.
• Refactored AES tests by splitting work-queue CPU tests into work_queue_tests (with an embedded-test executor for async coverage) and DMA work-queue tests into work_queue_dma_tests (gated by #[cfg(aes_dma)]).
• Replaced unsafe { peripherals::...::steal() } patterns in work-queue tests with safe peripheral ownership via esp_hal::init(...) in module #[init].

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
hil-test/src/bin/crypto/sha.rs	Moves common SHA test helpers to module scope and splits work-queue SHA backend tests into a separate embedded-test module with a proper init context.
hil-test/src/bin/crypto/aes.rs	Splits AES work-queue tests into CPU/async and DMA-specific embedded-test modules, each with an init context to own the backend(s).