Pass collection level on the Frontend config model

[abeddow91]

[!NOTE] This PR needs this DCR PR to be merged first: https://github.com/guardian/dotcom-rendering/pull/12828

What does this change?

Separates the collection level from the rest of the metadata tags onto its own property on the collection config. Currently, all tags come through as one metadata object to DCR but this primarily used for container palette tags by the platform and requires enhancement there to extract the collection level from the other container tags. This brings that transformation closer to the source.

Testing

On code, we can now see the collection level property come through in the pressed lite json for a container with a container level tag:

Checklist

• [x] Tested locally, and on CODE if necessary
• [ ] Will not break dotcom-rendering
• [ ] Will not break our database – if updating CAPI, updated and committed the database files
• [ ] Meets our accessibility standards
  • [ ] Tested with screen reader
  • [ ] Navigable with keyboard
  • [ ] Colour contrast passed

[github-actions[bot]]

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From guardian/actions-riff-raff.

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Seen on ADMIN-PROD (created by @abeddow91 and merged by @cemms1 13 minutes and 7 seconds ago)

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Seen on FRONTS-PROD (created by @abeddow91 and merged by @cemms1 14 minutes and 11 seconds ago)

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