Hikari-specific meters are not registered in the absence of a DataSourcePoolMetadataProvider

[wilkinsona]

Hikari provides native Micrometer integration that Boot auto-configures by configuring Hikari with a metrics tracker factory that uses the auto-configured MeterRegistry. At present, this auto-configuration is conditional on a DataSourcePoolMetadataProvider bean, however this isn't necessary as no such bean is required for exposing Hikari's native Micrometer metrics.

See #13295 for some background.