Add unit tests for `uploadPayload` #8002

Job	Run time
Split workflow (macos-latest, linked)	1m 13s
Split workflow (ubuntu-latest, linked)	1m 2s
Split workflow (macos-latest, default)	1m 14s
Split workflow (ubuntu-latest, nightly-latest)	1m 3s
Split workflow (ubuntu-latest, default)	1m 5s
Split workflow (macos-latest, nightly-latest)	1m 1s
	6m 38s

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