fix: allow overriding tooltip offset custom CSS properties #9788
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Description
Follow-up to #9760
Previously, custom CSS properties were copied from the host to overlay via JS. This will no longer be the case with the native popover version after #9785 is merged, as mentioned in #9785 (comment). Refactored Lumo CSS and JS to not set default values for these, and replaced them with a "private" fallback custom property.
Type of change