[7.14] Fix the usage of CacheIteratorHelper for service account (#75510) #75765
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CacheIteratorHelper requires lock acquisition for any mutation to the underlying cache. This means it is incorrect to manipulate the cache without invocation of CacheIteratorHelper#acquireUpdateLock. This is OK for caches of simple values, but feels excessive for caches of ListenableFuture. This PR update the cache invalidation code to use cache.forEach instead of CacheInvalidator. It simplifies the code by removing any explicit lockings. The tradeoff is that it needs to build a list of keys to delete in memory. Overall it is a better tradeoff since no explicit locking is required and better leverage of Cache's own methods.
ywangd added auto-merge-without-approval 
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Backports the following commits to 7.14: