feat: update OCI artifact downloader and media type handling (NR-510051) #2717

Job	Run time
⚖️ Check third party licenses	4m 56s
cargo doc (ubuntu-latest)	1m 44s
cargo doc (windows-latest)	3m 27s
cargo shear (unused dependencies) (ubuntu-latest)	14s
cargo shear (unused dependencies) (windows-latest)	1m 10s
codespell	13s
cargo fmt	15s
ubuntu / stable / coverage	1m 42s
cargo clippy (windows-latest)	1m 40s
cargo clippy (ubuntu-latest)	43s
Build release binaries	2m 2s
tests as root (ubuntu-latest)	3m 25s
K8s integration tests (part2)	6m 7s
tests as root (windows-latest)	6m 13s
Unit test for embedded downloader	30s
Unit, docs and onhost integration tests (windows-latest)	13m 17s
K8s integration tests (flux-self-update)	7m 4s
tests with oci registry (ubuntu-latest)	2m 52s
tests with oci registry (windows-latest)	5m 47s
security / Rust audit scanner	2m 37s
Unit, docs and onhost integration tests (ubuntu-latest)	7m 45s
K8s integration tests (part1)	9m 7s
k8s-e2e-tests / K8s e2e tests infra	9m 54s
k8s-e2e-tests / K8s e2e tests	4s
🟢 All required checks and tests pass	4s
	1h 32m 52s

Provide feedback