contrib/envoyproxy: fix context propagation from envoy tracing #1986

Job	Run time
Verify generated files are up-to-date	3m 16s
Verify generated files are up-to-date	3m 16s
Go Versions Matrix	16s
Go Versions Matrix	16s
Integration Test (ubuntu \| oldstable \| DRIVER)	10m 36s
Integration Test (ubuntu \| oldstable \| DRIVER)	10m 36s
Integration Test (ubuntu \| stable \| DRIVER)	11m 17s
Integration Test (ubuntu \| stable \| DRIVER)	11m 17s
Integration Test (ubuntu \| 1.24.0-rc.3 \| DRIVER)	11m 17s
Integration Test (ubuntu \| 1.24.0-rc.3 \| DRIVER)	11m 17s
Integration Test (macos \| oldstable \| DRIVER)	14m 52s
Integration Test (macos \| oldstable \| DRIVER)	14m 52s
Integration Test (macos \| stable \| DRIVER)	11m 7s
Integration Test (macos \| stable \| DRIVER)	11m 7s
Integration Test (macos \| 1.24.0-rc.3 \| DRIVER)	13m 9s
Integration Test (macos \| 1.24.0-rc.3 \| DRIVER)	13m 9s
Integration Test (windows \| oldstable \| DRIVER)	35m 31s
Integration Test (windows \| oldstable \| DRIVER)	35m 31s
Integration Test (windows \| stable \| DRIVER)	39m 3s
Integration Test (windows \| stable \| DRIVER)	39m 3s
Integration Test (windows \| 1.24.0-rc.3 \| DRIVER)	26m 24s
Integration Test (windows \| 1.24.0-rc.3 \| DRIVER)	26m 24s
Integration Test (ubuntu \| oldstable \| TOOLEXEC)	10m 29s
Integration Test (ubuntu \| oldstable \| TOOLEXEC)	3m 38s
Integration Test (ubuntu \| oldstable \| GOFLAGS)	10m 50s
Integration Test (ubuntu \| oldstable \| GOFLAGS)	10m 50s
Orchestrion Integration Tests	1s
Orchestrion Integration Tests	1s
	6h 29m 25s

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