Metadata: Information from schema:description missing in the UI

[sosiology]

Describe the Enhancement
metadata is still missing on certain filters and legends in both the published chart and editor mode.
Reference: https://gitlab.ldbar.ch/bafu/umweltdatenkiosk-planning/-/issues/350#note_8705

To Reproduce
Steps to reproduce the behavior:

1. Go to 'https://int.visualize.admin.ch/en/create/n9fdoq_th318?dataSource=Int'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
Metadata should be shown on the following filters and legends (see yellow highlighted areas in screenshots below)

Environment (please complete the following information):

• Visualize environment and version: INT v3.9.2 ([3fc980f], Datasource: INT
• Browser and version [e.g. Chrome 95]

Additional context
Related to: #341

[sosiology]

@ortnever I created a new issue in github for the metadata so we can track the issue (also see: https://gitlab.ldbar.ch/bafu/umweltdatenkiosk-planning/-/issues/350. We will try to tackle this issue this week, so it can be tested before we deploy to production next week.