XDS server only accept one connection from client

[YaoZengzeng]

How to reproduce:

Run server_secret_rotation.rs and client.rs in orion-xds/examples, the log of client will include:

2025-08-12T07:35:16.500634Z  WARN orion_xds::xds::client: xDS client error: "gRPC error (Internal error): Delta stream is unavailable"
2025-08-12T07:35:16.500708Z  WARN orion_xds::xds::client: xDS client interupted: gRPC error (Internal error): Delta stream is unavailable, retrying in 20s

cc @hanshal101

[hanshal101]

Thanks for this, I'll take up this one

[hanshal101]

/assign

[Eeshu-Yadav]

@YaoZengzeng should i finish this

[hanshal101]

@YaoZengzeng should i finish this

Hello @Eeshu-Yadav I am already working on this! Since the code review is still pending I haven't made any changes here.

[Eeshu-Yadav]

@YaoZengzeng should i finish this

Hello @Eeshu-Yadav I am already working on this! Since the code review is still pending I haven't made any changes here.

see my comment there in the pr