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ARROW-18247: [JS] fix: RangeError crash in Vector.toArray() (#14587)

This fixes a bug which happens when a Vector has been created with multiple data blobs and at least one of them has been padded.

See https://observablehq.com/d/14488c116b338560 for a reproduction of the error and more details.

Lead-authored-by: Thomas Sarlandie <thomas@sarlandie.net>
Co-authored-by: Dominik Moritz <domoritz@gmail.com>
Co-authored-by: Paul Taylor <paul.e.taylor@me.com>
Signed-off-by: Dominik Moritz <domoritz@gmail.com>