Revert "WIKI-740 WikiServiceImpl.getPageById invocation causes slowness"

This reverts commit 3bd18f292806b32c8cf00b29d0f661fee0fb76ad.
WIKI-762 [Migration] Failed to get version of wiki page due to session timeout

Fix description
* Cache only wiki page UUID instead of wiki page object to avoid getting data from dead session
* Get page by UUID instead of querying page to improve the performance