Add hw intrinsics pipeline for linux_arm64#127482

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dhartglassMSFT wants to merge 4 commits intodotnet:mainfrom

dhartglassMSFT:arm64_hwintrinsics_leg

Commits on Apr 27, 2026

pipeline skeleton impl, copied from hardware-intrinsics.yml
dhartglassMSFT
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Commits on Apr 28, 2026

hoist hwintrin markup into common file
dhartglassMSFT
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Commits on Apr 30, 2026

trigger off a few more files
dhartglassMSFT
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Commits on May 1, 2026

pr feedback
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