Patroni dashboards has to contain hostname information

## Steps to reproduce

1. Install charm and relate it to cos
2. Open patroni dashboard

## Expected behavior
To be able to choose what identifier has to be used in the graphs, hostname or juju unit name. This is important for managed solutions customers, because they are not aware of juju topology

## Actual behavior
Only unit names are avaliable

## Versions

Operating system:

Juju CLI: 3.6.14

Juju agent: 3.6.14

Charm revision: 1047 and 1158

LXD: N/A

## Log output

Juju debug log:

## Additional context

Reproduce the issue by installing the charm, relating it to COS, and opening the Patroni dashboard. Then trace the charm's dashboard integration to see where graph identifiers are supplied. Done means the dashboard lets users choose hostname or Juju unit name, with hostname information available for managed-solution customers.

Written by the indexing model from the issue text.