Add unit tests for `uploadPayload` #5958

Job	Run time
Ruby analysis (ubuntu-latest, linked)	47s
Ruby analysis (macos-latest, nightly-latest)	1m 13s
Ruby analysis (ubuntu-latest, default)	51s
Ruby analysis (macos-latest, linked)	1m 19s
Ruby analysis (macos-latest, default)	58s
Ruby analysis (ubuntu-latest, nightly-latest)	51s
	5m 59s

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