Column lineage doesn't work with symlink dataset

[sophiely]

Listing Dataset threw an exception if one of the dataset has a symlink and a column lineage:

The symlink dataset is now linked in the lineage but this symlink dataset is not necessarily in the same namespace so it can be find.

java.util.NoSuchElementException: No value present
! at java.base/java.util.Optional.get(Optional.java:143)
! at marquez.service.ColumnLineageService.lambda$enrichWithColumnLineage$21(ColumnLineageService.java:224)
! at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
! at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1845)
! at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762)
! at marquez.service.ColumnLineageService.enrichWithColumnLineage(ColumnLineageService.java:217)

[wslulciuc]

Fixed #2775