ci: restructure Enhanced Vision tests into 6 functional CI groups (#42) #179

Job	Run time
Build Khronos OpenVX sample	55s
build	1m 58s
Build rustVX (main)	0s
data-objects	10s
graph	10s
vision-color	13s
baseline	10s
vision-filters	57s
image-ops	15s
vision-statistics	11s
vision-geometric	38s
Enhanced-Vision: Advanced Filtering	57s
vision-pyramid	11s
vision-features	29s
vision-arithmetic	25s
Enhanced-Vision: Feature Extraction	12s
Enhanced-Vision: Control Flow	9s
Enhanced-Vision: Post-Processing	15s
KHR extension: user-data-object	11s
Enhanced-Vision: Tensor Arithmetic	12s
Enhanced-Vision: Tensor Transforms	12s
Perf gate (PR vs main)	0s
Benchmark & compare (rustVX vs Khronos sample)	4m 29s
	13m 19s

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