Add unit tests for `uploadPayload` #7999

Job	Run time
Split workflow (macos-latest, nightly-latest)	1m 54s
Split workflow (macos-latest, default)	1m 49s
Split workflow (ubuntu-latest, default)	1m 16s
Split workflow (macos-latest, linked)	1m 42s
Split workflow (ubuntu-latest, linked)	1m 26s
Split workflow (ubuntu-latest, nightly-latest)	1m 21s
	9m 28s

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