Minor optimization: By setting the server_name field, add gateway specific response headers

[tmsnan]

Description:

By setting the server_name field, add gateway specific response headers. We can set the default value of server_name to "envoy-gateway" or other. 😄 [optional Relevant Links:] https://github.com/envoyproxy/envoy/blob/be410d6121fefb2d57468261180aa354fb8020b5/api/envoy/extensions/filters/network/http_connection_manager/v3/http_connection_manager.proto#L465C1-L468C87

[zirain]

what about use Gateway name?

[tmsnan]

what about use Gateway name?

{The gateway name}_gateway or just the gateway name

[github-actions[bot]]

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