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ARROW-18178: [Java] ArrowVectorIterator incorrectly closes Vectors (#14534)

Prevent vectors from being closed when ArrowVectorIterator closes in the case where the reuseVectorSchemaRoot flag is set to false. 

Test in JDBCToArrowVectorIteratorTest was updated to cover this case. 

Tests in  UnreliableMetaDataTest were modified to manually close VectorSchemaRoots, preventing an unclosed buffer exception being thrown when the RootAllocator was closed. 

Authored-by: Larry White <lwhite1@users.noreply.github.com>
Signed-off-by: David Li <li.davidm96@gmail.com>