Change waitForProcessing to use exponential backoff #8061

Job	Run time
Ruby analysis (ubuntu-latest, nightly-latest)	47s
Ruby analysis (macos-latest, nightly-latest)	58s
Ruby analysis (macos-latest, linked)	1m 4s
Ruby analysis (macos-latest, default)	1m 17s
Ruby analysis (ubuntu-latest, default)	50s
Ruby analysis (ubuntu-latest, linked)	45s
	5m 41s

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