fix(metrics): hijacker should not pass accept-encoding (backport of #7572)

[kumahq]

Automatic cherry-pick of #7572 for branch release-2.0

Generated by action

cherry-picked commit 45db906
⚠️ ⚠️ ⚠️ Conflicts happened when cherry-picking! ⚠️ ⚠️ ⚠️

On branch release-2.0
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	both modified:   app/kuma-dp/pkg/dataplane/metrics/server.go

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