Gateway API: support retries + backend request timeout

[skriss]

Once Gateway API adds support for configuring retries, they should be implemented along with implementing backend request timeout.

Follow-up from #5921

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[lubronzhan]

Upstream PR is stale kubernetes-sigs/gateway-api#1731
People are arguing implementing retries per route or globally

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The Contour project currently lacks enough contributors to adequately respond to all Issues.

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