docs: document service ping configuration and data sent (#10167)

# Which Problems Are Solved

With the introduction of the service ping, we'll send data from all
systems back to a central endpoint for analytics and getting insights
about usage. To make it visible what data is sent and provide the users
an easy way to opt-out, we need a small documentation to tell them what
and how.

# How the Problems Are Solved

Document the service ping including what data is sent and how to opt-out
or configure most important settings.

# Additional Changes

None

# Additional Context

relates to #9869

docs/sidebars.js

@@ -1117,6 +1117,7 @@ module.exports = {
         "self-hosting/manage/tls_modes",
         "self-hosting/manage/database/database",
         "self-hosting/manage/cache",
+        "self-hosting/manage/service_ping",
         "self-hosting/manage/updating_scaling",
         "self-hosting/manage/usage_control",
         {