Expose `Observable[Unit]` instead of `Observable[Void]`#1282

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stIncMale merged 3 commits intomongodb:masterfrom

stIncMale:JAVA-4303

Jan 5, 2024

Commits on Dec 15, 2023

Expose `Observable[Unit]` instead of `Observable[Void]`
stIncMale
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Commits on Jan 4, 2024

Move `ToGridFSUploadPublisherUnit` such that it's not global; add the test proposed by Ross
stIncMale
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Update the test code such that it hopefully compiles in Scala 2.11 and 2.12
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