opentelemetry-go: BSD kenv command not using absolute path enables PATH hijacking

Summary The fix for GHSA-9h8m-3fm2-qjrq CVE-2026-24051 changed the Darwin ioreg command to use an absolute path but left the BSD kenv command using a bare name, allowing the same PATH hijacking attack on BSD and Solaris platforms. Root Cause sdk/resource/hostid.go line 42: if result, err :=...