[SYCL] Remove plugin interface #7339

Job	Run time
detect_changes / Decide which tests could be affected by the changes	6s
build / Build + LIT	8m 51s
Decide which Arc tests to run	1s
test-perf	0s
test (AMD/HIP, ["Linux", "amdgpu"], ghcr.io/intel/llvm/ubuntu2204_build:latest-0300ac924620a51f76... / AMD/HIP	11m 7s
test (E2E tests with dev igc on Intel Arc A-Series Graphics, ["Linux", "arc"], ghcr.io/intel/llvm... / E2E tests with dev igc on Intel Arc A-Series Graphics	8m 11s
test (E2E tests on Intel Arc A-Series Graphics, ["Linux", "arc"], ghcr.io/intel/llvm/ubuntu2204_i... / E2E tests on Intel Arc A-Series Graphics	8m 11s
test (Intel, ["Linux", "gen12"], ghcr.io/intel/llvm/ubuntu2204_intel_drivers:latest, -u 1001 --de... / Intel	42m 30s
test (NVIDIA/CUDA, ["Linux", "cuda"], ghcr.io/intel/llvm/ubuntu2204_build:latest, -u 1001 --gpus ... / NVIDIA/CUDA	28m 7s
	1h 47m 4s

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