Fix SpecialPageStatistics to match table schema for MediaWiki 1.35

[djflux]

This change is related to #120. The revision table schema changed and the data that Special:PageStatistics gathers is now located in a couple of tables:

• revision_actor_temp - contains the page revisions and the actor_id (formerly rev_user in revision table)
• actor - table contains actor_id and actor_name (formerly rev_user_text)

The changes update the SELECT statement and the relevant Linker::UserLink code.

Tested on real Red Hat Enterprise Linux version 8.6 installed via this kickstart file:

https://www.mediawiki.org/w/index.php?title=User:Djflux/rhel8-min-cdrom-text&action=raw

Demo Wiki installed via the rhel8-35.x branch of meza from here: https://github.com/djflux/meza/tree/rhel8-35.x

Wiki versions

Product	Version
MediaWiki	1.35.7 (c6ddc4a)
PHP	7.4.19 (fpm-fcgi)
MariaDB	10.3.32-MariaDB-log
ICU	60.3
Elasticsearch	6.8.23

Extension	Version	License	Description	Authors
WatchAnalytics	3.2.0 (adf3421) 16:52, 26 April 2022	License	Encouraging good distribution of watchers	James Montalvo

[olsonjaredm]

Concur with this pull request, tested working on 1.35.6 and fixes error below. Thanks djflux.

Error 1054: Unknown column 'rev.rev_user' in 'field list' (c110d_mysql_db)
Function: SpecialPageStatistics::renderPageStats

Product	Version
MediaWiki	1.35.6
PHP	7.4.30 (apache2handler)
MariaDB	10.6.7-MariaDB
ICU	60.3
Elasticsearch	6.8.23
Lua	5.1.5

[djflux]

For Your Situational Awareness (FYSA), the table schema changed again in MW 1.39 so this PR will work for only MW 1.35. Check here for more fixes for MW 1.39 compatibility:

https://github.com/djflux/WatchAnalytics/tree/REL1_39
djflux#1