Add unit tests for `uploadPayload` #5945

Job	Run time
Ruby analysis (macos-latest, nightly-latest)	56s
Ruby analysis (ubuntu-latest, default)	1m 5s
Ruby analysis (ubuntu-latest, linked)	51s
Ruby analysis (macos-latest, linked)	2m 53s
Ruby analysis (macos-latest, default)	1m 1s
Ruby analysis (ubuntu-latest, nightly-latest)	50s
	7m 36s

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