fix: ensure upstream scheme is set only if not already defined in HTTP route translation (#2691) (c48e9b3)

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🔄 Automated Backport

• Upstream commit: apache/apisix-ingress-controller@c48e9b3
• Original title: fix: ensure upstream scheme is set only if not already defined in HTTP route translation (#2691)
• Original author: Timmy zhu327@gmail.com

Please review and run the relevant validation before merging.

Created automatically by backport-bot.

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