incrementalDelivery: refactoring and streamlining

[yaacovCR]

Each commit is meant to merged separately, i.e. "Rebase and Merge" rather than "Squash and Merge"

5b8a807d: moves executeStreamField out of try block to better illustrate which code might throw 2673e3a4: introduces a new completeListItemValue function, extracted from completeListItem d987c380: uses this new function within completeAsyncIteratorValue as suggested by the TODO fda77443: tiny refactor pushing the result of handleFieldError rather than explicit null, following convention elsewhere 58eaf9d0: rename fieldPath to itemPath when dealing with items, as elsewhere 0ab22566: skip unnecessary filtering when asyncIterator's next method throws, aligning stream to non-stream

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[yaacovCR]

this will have to come after #3746 and #3747

[yaacovCR]

completeListItemValue has been separated out into #3728 -- this is now ready for merge.