Improved logging during ocr-workspace-cleanup

[edsu]

We are noticing long lags (multiple minutes) during the ocrWF's ocr-workspace-cleanup in production. There doesn't appear to be any information about the sleeping behavior in the logs, which would be helpful for diagnosing what is going on:

common-accessioning/lib/dor/text_extraction/ocr.rb

Lines 105 to 111 in 71afcdd

	loop do
	delete_folder(abbyy_output_path)
	tries += 1
	break if !Dir.exist?(abbyy_output_path) || Dir.empty?(abbyy_output_path) || tries > max_tries
	sleep((Settings.sleep_coefficient * 2)**tries)
	end