feat(TeamParticipants): include tournament start and end dates

[Eetwalt]

Summary

• Include tournament start and end dates when querying team participants

How did you test this change?

dev

https://liquipedia.net/counterstrike/User:Eetwalt

[Copilot]

Pull request overview

This PR extends the TeamParticipants pipeline to populate player join/leave dates (either explicitly via wiki input or automatically via LPDB transfer lookups bounded by the tournament start/end dates), and exposes those dates via page vars for downstream consumption.

Changes:

• Parse joindate / leavedate from wiki input into each player’s extradata.
• Enrich players by querying the transfer LPDB table (within tournament_startdate → tournament_enddate) when explicit dates are missing.
• Persist joindate / leavedate into global page variables and add a dedicated spec file for the new behavior.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
lua/wikis/commons/TeamParticipants/Repository.lua	Adds transfer-date lookup logic and writes join/leave dates into global page vars.
lua/wikis/commons/TeamParticipants/Parse/Wiki.lua	Parses joindate / leavedate from wiki input into player.extradata.
lua/wikis/commons/TeamParticipants/Controller.lua	Adds a render-time enrichment step to fill missing join/leave dates via the repository.
lua/spec/team_participants_dates_spec.lua	Adds unit tests covering parsing, LPDB lookup fallbacks, and page-var writes.
lua/definitions/mw.lua	Extends the test mw.language:formatDate mock to support Y-m-d.

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[hjpalpha]

this will worsen perf, why not first use the squad data during that import (start date should be retrievable from it if there is a squad entry and if the squad entry has a leave date that works as leave date if not the leave date automatically is tournament enddate) and only query if after that some players still have the dates unset (i.e. ones that did not get added by squad import)?

this is counterproductive for craft wikis, so a way to disable this would be good, preferably via a global setting so it doesn't have to be disabled in every single team participant

i think this adds a blocker for rollout on warcraft (which currently could use the new stuff)
and adds additional blockers for sc, sc2 (which still have 2 additional ones already)

[Rathoz]

It's already enabled, always, on the existing TeamCard