Add unit tests for `uploadPayload` #10564

Job	Run time
analyze-other (python)	1m 0s
analyze-other (actions)	55s
check-codeql-versions	34s
analyze-javascript (ubuntu-24.04)	4m 7s
analyze-javascript (ubuntu-22.04)	4m 4s
analyze-javascript (windows-2022)	6m 41s
analyze-javascript (windows-2025, linked)	5m 40s
analyze-javascript (macos-13, linked)	13m 18s
analyze-javascript (ubuntu-24.04, linked)	4m 2s
analyze-javascript (macos-15, linked)	9m 1s
analyze-javascript (macos-13)	10m 21s
analyze-javascript (ubuntu-22.04, linked)	3m 59s
analyze-javascript (macos-14, linked)	7m 12s
analyze-javascript (windows-2022, linked)	5m 55s
analyze-javascript (windows-2025)	6m 35s
analyze-javascript (macos-14)	6m 34s
analyze-javascript (macos-15)	8m 32s
	1h 38m 30s

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