Add logging when project authorizations refreshes are performed with delay

What does this MR do and why?

With !97805 (merged), we made changes such that big batches of project authorizations refreshes are carried out in smaller batches, with a slight amount of delay between each batch.

However, we did not add any logging to measure how many of our refreshes are actually performed with a delay. This MR adds such a logging so that it is easier for us to measure the effectiveness of this change.

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