[8.1.0] Use Single.using instead of onError/onSuccess for async uploads
#25251
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Users have reported hangs in Bazel's asynchronous remote cache uploads that may be happening because neither `onSuccess` nor `onError` is called on the observer. Work towards bazelbuild#25232 Closes bazelbuild#25231. PiperOrigin-RevId: 725235495 Change-Id: I20c3aaa2ee57a52041dea0b3c17356445f2bbc34
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Users have reported hangs in Bazel's asynchronous remote cache uploads that may be happening because neither
onSuccessnoronErroris called on the observer.Work towards #25232
Closes #25231.
PiperOrigin-RevId: 725235495
Change-Id: I20c3aaa2ee57a52041dea0b3c17356445f2bbc34
Commit d4c9b92