Change waitForProcessing to use exponential backoff #8103

Job	Run time
Ruby analysis (macos-latest, linked)	1m 15s
Ruby analysis (ubuntu-latest, linked)	45s
Ruby analysis (macos-latest, default)	55s
Ruby analysis (ubuntu-latest, nightly-latest)	48s
Ruby analysis (macos-latest, nightly-latest)	1m 6s
Ruby analysis (ubuntu-latest, default)	47s
	5m 36s

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