attestation: Enforce strict DEK format check for 3-blob VMGS #1463

Job	Run time
build mdbook guide	1m 21s
build artifacts [x64-linux]	6m 4s
build and check docs [x64-windows]	10m 12s
build openhcl [x64-linux]	7m 55s
clippy [windows], unit tests [x64-windows]	11m 12s
clippy [linux, macos], unit tests [x64-linux]	8m 13s
build openhcl [aarch64-linux]	5m 18s
clippy [linux-musl, misc nostd], unit tests [x64-linux-musl]	7m 13s
unit tests [aarch64-windows]	7m 8s
build and check docs [x64-linux]	2m 41s
test flowey local backend	3m 8s
xtask fmt (linux)	2m 18s
build artifacts (not for VMM tests) [aarch64-windows]	5m 51s
build artifacts (for VMM tests) [aarch64-windows]	10m 18s
build artifacts (for VMM tests) [x64-windows]	9m 25s
build artifacts [aarch64-linux]	5m 20s
build artifacts (not for VMM tests) [x64-windows]	6m 8s
xtask fmt (windows)	7m 54s
run vmm-tests [aarch64-windows]	6m 2s
run vmm-tests [x64-windows-intel]	9m 42s
run vmm-tests [x64-windows-amd]	11m 2s
run vmm-tests [x64-linux]	3m 33s
openvmm checkin gates	8s
	2h 28m 6s

Provide feedback