Create a special page for viewing global user contributions
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Description

Special:GlobalUserContributions is defined in the CheckUser extension
It is available conditional on a feature flag (defaults to off)
It is accessible by users with the checkuser-temporary-account right
All other users get a permission error for now (see T349902#9502168)
Pending final designs, the form will have:
- A user text input that accepts user names, IP addresses and IP ranges
- A submit button

Status	Assigned	Task
In Progress	Niharika	T324492 Temporary accounts - MVP
Open	Niharika	T337012 Tracking task for community-owned and maintained tools that will be impacted by Temporary Accounts
Open	None	T337089 [Epic] Implement global user contributions feature
Open	None	T356292 Return global contributions by temporary accounts given an IP address or range
Open	Tchanders	T356289 Create a special page for viewing global user contributions

Change 1005157 had a related patch set uploaded (by Tchanders; author: Tchanders):

[mediawiki/extensions/CheckUser@master] WIP Add Special:IPContributions for seeing temp account edits

From the task description:

It is available conditional on a feature flag (defaults to off)

I don't think we need this if this is done before testwiki deployment, and if T356290 is merged soon after or at the same time.

That would leave us with:

No change on WMF production and for wikis with temp accounts disabled
A special page with basic functionality working in the rare case that some non-WMF production wiki has temp accounts enabled