Once T243073: Add primary key to pagetriage_page_tags is merged, the alters will need to be run on WMF wikis

1. ALTERs to run: https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/PageTriage/+/567390/7/sql/PageTriagePageTagsPatch-pk.sql[1]
2. Where to run those changes: testwiki, test2wiki, enwiki[2]
3. When to run those changes: Whenever is convenient
4. If the schema change is backwards compatible: Yes (converts unique index to primary key)
5. If the schema change has been tested already on some of the test/beta wikis: Not yet
6. If the data should be made available on the labs replicas and/or dumps: Yes, data in this table is public.

ALTER TABLE /*_*/pagetriage_page_tags
DROP INDEX /*i*/ptrpt_page_tag_id,
ADD PRIMARY KEY (ptrpt_page_id,ptrpt_tag_id);

'wmgEnablePageTriage' => [
	'default' => false,
	'testwiki' => true,
	'test2wiki' => true,
	'enwiki' => true,
],

Schema change progress:

• enwiki
  • eqiad progress T243804#5847199
  • codfw
• testwiki
• test2wiki