fix context canceled recv error handling

[Kuromesi]

When I send a request without request body, will always come up with an error like:

2025-02-23T10:30:23+08:00	ERROR	handlers/server.go:99	Cannot receive stream request
sigs.k8s.io/gateway-api-inference-extension/pkg/epp/handlers.(*Server).Process
	/root/MyCOde/kuromesi.com/gateway-api-inference-extension/pkg/epp/handlers/server.go:99
github.com/envoyproxy/go-control-plane/envoy/service/ext_proc/v3._ExternalProcessor_Process_Handler
	/root/go/pkg/mod/github.com/envoyproxy/go-control-plane/[email protected]/service/ext_proc/v3/external_processor_grpc.pb.go:106
google.golang.org/grpc.(*Server).processStreamingRPC
	/root/go/pkg/mod/google.golang.org/[email protected]/server.go:1690
google.golang.org/grpc.(*Server).handleStream
	/root/go/pkg/mod/google.golang.org/[email protected]/server.go:1814
google.golang.org/grpc.(*Server).serveStreams.func2.1
	/root/go/pkg/mod/google.golang.org/[email protected]/server.go:1030

When I tried to debug this error, I found that this error is grpc status context canceled error, and current condition fails to catch this error since this is not an context.Canceled error.

if recvErr == io.EOF || errors.Is(recvErr, context.Canceled)

So I rewrite the condition to make sure this error can be correctly handled.

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[ahg-g]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahg-g, Kuromesi

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