Inspect with an unknown mesh returns a non helpful error message

[lahabana]

What happened?

$ ./build/artifacts-darwin-arm64/kumactl/kumactl inspect timeout timeout-all-default -m foo
Error: Could not list Dataplanes (Not found)

It should say the mesh doesn't exist.

It looks like it's there:

kuma/pkg/api-server/inspect_endpoints.go

Lines 261 to 265 in 27ea0f0

	meshContext, err := builder.Build(ctx, meshName)
	if err != nil {
	rest_errors.HandleError(request.Request.Context(), response, err, "Could not list Dataplanes")
	return
	}

I guess we return a NotFound error from the store. We should do a better job there, probably a dedicated error or something like this.

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[lakshya8066]

HI @lahabana can I work on this?

[lahabana]

Of course!

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[slonka]

$ ./build/artifacts-darwin-arm64/kumactl/kumactl inspect timeout timeout-all-default -m foo
Error: Could not list Dataplanes (Not found)

still the same

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