Add unit tests for `uploadPayload` #3751

Job	Run time
Build mode autobuild (windows-latest, nightly-latest)	6m 5s
Build mode autobuild (ubuntu-latest, linked)	1m 35s
Build mode autobuild (ubuntu-latest, nightly-latest)	1m 44s
Build mode autobuild (windows-latest, linked)	4m 40s
	14m 4s

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