Fix #11457: Use proxy-defaults protocol if service-defaults protocol is unset #14344

Job	Run time
conditional-skip / Check whether to skip build and tests	28s
get-envoy-versions / Determine supported Envoy versions	7s
get-go-version / Determine Go toolchain version	7s
Setup	4s
integration-test-with-deployer	1m 35s
Generate Envoy Job Matrices	5s
dev-build / build	1m 15s
compatibility-integration-test	8m 53s
envoy-integration-test (server, case-api-gateway-http-tls-overlapping-hosts\|case-terminating-gate...	6m 37s
vault-integration-test (1.17.5)	2m 19s
envoy-integration-test (server, case-cross-peers-resolver-redirect-tcp\|case-centralconf\|case-stat...	6m 25s
nomad-integration-test (v1.8.3)	1m 13s
vault-integration-test (1.16.3)	2m 46s
envoy-integration-test (server, case-cfg-resolver-features\|case-wanfed-gw\|case-api-gateway-tcp-tl...	5m 54s
nomad-integration-test (v1.7.7)	2m 10s
vault-integration-test (1.15.6)	2m 11s
envoy-integration-test (server, case-grpc)	1m 51s
nomad-integration-test (v1.6.10)	1m 59s
envoy-integration-test (client, case-api-gateway-http-tls-overlapping-hosts\|case-terminating-gate...	6m 38s
envoy-integration-test (client, case-cross-peers-resolver-redirect-tcp\|case-centralconf\|case-stat...	6m 8s
envoy-integration-test (client, case-cfg-resolver-features\|case-wanfed-gw\|case-api-gateway-tcp-tl...	5m 23s
envoy-integration-test (client, case-grpc)	2m 4s
test-integrations-success	1s
	1h 6m 13s

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