Change waitForProcessing to use exponential backoff #8125

Job	Run time
Ruby analysis (macos-latest, nightly-latest)	1m 7s
Ruby analysis (macos-latest, default)	1m 4s
Ruby analysis (ubuntu-latest, linked)	48s
Ruby analysis (ubuntu-latest, default)	49s
Ruby analysis (macos-latest, linked)	1m 11s
Ruby analysis (ubuntu-latest, nightly-latest)	52s
	5m 51s

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