fix(@typespec/http): `@head` response with body wrongly flags content type#9869

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copilot/fix-head-request-content-type

Commits on Mar 2, 2026

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fix: @head request with body wrongly flags content type - emit head-verb-body warning

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fix: address code review - add head-verb-body warning test in verbs.test.ts, improve changeset

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Commits on Mar 3, 2026

fix: address reviewer feedback - rename to head-no-body, simplify to treatContentTypeAsHeader, revert tsp-for-openapi3.ts

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