Add unit tests for `uploadPayload` #10551

Job	Run time
check-codeql-versions	32s
analyze-other (python)	57s
analyze-other (actions)	45s
analyze-javascript (ubuntu-22.04, linked)	4m 0s
analyze-javascript (ubuntu-24.04, linked)	3m 59s
analyze-javascript (ubuntu-22.04)	4m 14s
analyze-javascript (macos-13)	14m 25s
analyze-javascript (ubuntu-24.04)	4m 8s
analyze-javascript (windows-2025, linked)	6m 3s
analyze-javascript (windows-2025)	6m 16s
analyze-javascript (macos-13, linked)	9m 33s
analyze-javascript (macos-14, linked)	7m 42s
analyze-javascript (windows-2022)	7m 34s
analyze-javascript (windows-2022, linked)	5m 58s
analyze-javascript (macos-15, linked)	9m 21s
analyze-javascript (macos-15)	8m 52s
analyze-javascript (macos-14)	8m 36s
	1h 42m 55s

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