Increase the default DPP refresh interval from 1s to 10s

[lobkovilya]

Description

Having it equal to 1s is too aggressive, 10s is a better default:

kuma/pkg/config/app/kuma-cp/kuma-cp.defaults.yaml

Line 122 in 866e1b5

dataplaneConfigurationRefreshInterval: 1s # ENV: KUMA_XDS_SERVER_DATAPLANE_CONFIGURATION_REFRESH_INTERVAL

[slonka]

Triage: it's the watchdog ticker. We have a metric from a customer showing that snapshot generation jumped to 40s. Do we have a way to figure out if 10s is a good number? Let's check mesh perf as guidance.