Fix work item skeleton loaders for extra pages

Simon Knoxrequested to merge
psi-wi-note-loading into master

What does this MR do and why?

Fixes No loading state on work item notes pagination (#490659 - closed)

Changelog: fixed

Previously we were setting loadingMore = false immediately after the query() promise resolved, rather than actually waiting for the response

How to set up and validate locally

  1. Load work item with >50 notes
  2. Make sure skeleton loader appears
Edited by Simon Knox

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