Change waitForProcessing to use exponential backoff #8060

Job	Run time
Ruby analysis (ubuntu-latest, linked)	47s
Ruby analysis (macos-latest, nightly-latest)	53s
Ruby analysis (ubuntu-latest, default)	45s
Ruby analysis (macos-latest, linked)	49s
Ruby analysis (macos-latest, default)	2m 32s
Ruby analysis (ubuntu-latest, nightly-latest)	43s
	6m 29s

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