Add unit tests for `uploadPayload` #5953

Job	Run time
Ruby analysis (macos-latest, nightly-latest)	1m 0s
Ruby analysis (ubuntu-latest, default)	51s
Ruby analysis (ubuntu-latest, linked)	44s
Ruby analysis (macos-latest, linked)	1m 9s
Ruby analysis (ubuntu-latest, nightly-latest)	48s
Ruby analysis (macos-latest, default)	1m 2s
	5m 34s

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