add MCP in the list of service registries (#18096)
add MCP in the list of service registries (#18096)

Signed-off-by: Rama Chavali <40109507d7c707c570c476fc1522e2d26df7f15e@salesforce.com>
smawson/istio,smawson/istio,smawson/istio,istio/istio,geeknoid/istio,geeknoid/istio,smawson/istio,geeknoid/istio,geeknoid/istio,smawson/istio,istio/istio,istio/istio,smawson/istio,geeknoid/istio,istio/istio,geeknoid/istio,istio/istio