R1:74a36f9d7bf0

Read "Database Status" page connection information from cluster config if present

Summary:
Fixes T11043. This page was still reading the old information directly instead of going through the cluster-aware stuff.

Have it ask the cluster-aware stuff for information instead.

Test Plan:
- Nuked MySQL on localhost.
- Configured cluster hosts.
- Loaded "Database Status" page -- worked after patch.
- Grepped for any remaining `mysql.configuration-provider` stragglers, came up empty.

Reviewers: chad…