Add unit tests for `uploadPayload` #8019

Job	Run time
Split workflow (macos-latest, default)	1m 32s
Split workflow (macos-latest, linked)	1m 33s
Split workflow (ubuntu-latest, linked)	1m 23s
Split workflow (ubuntu-latest, nightly-latest)	1m 10s
Split workflow (ubuntu-latest, default)	1m 10s
Split workflow (macos-latest, nightly-latest)	1m 24s
	8m 12s

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