Pass nested content label to `PropertyRecord.description`

[Yato333]

Part of #654

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🦋 Changeset detected

Latest commit: 8b624dcbc4e8073ce7f0e1f80e3b11a13d181570

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

| Name | Type | | ------------------------------ | ----- | | @itwin/presentation-components | Patch | | @itwin/presentation-testing | Patch |

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