chore(notifications): add notif for MATIC wind-down

[moo-onthelawn]

Goal: show notif for MATIC proposal winddown, and then MATIC winddown (if it goes through)

• Did it with statsig so that it can easily be toggled on/off when the official mainnet proposal goes in (without me having to make a new PR and cut).
• Also removed rndrParamProposal which is expired at this point

*Note that we'll never show both notifs at the same time (with the date restrictions) - I just manually changed local code to make it easier to screenshot

https://github.com/user-attachments/assets/bd29f817-3fca-4ffe-b846-7f1f965a1619

---

Constants/Types

• constants/notifications.ts
  • Added MarketWindDownMatic and MarketWindDownProposalMatic
  • Thought about removing old expired ones, but felt it was good to have them to make sure we don't accidentally duplicate notif ids (even if it's really unlikely?)
• constants/statsig.ts
  • Add dcMaticProposalNotif which has value: [linkToMainnetProposalWhenLive]

Hooks

• hooks/useNotificationTypes
  • Add in notif for proposal and wind down
  • I don't have a more specific date than Sep 4 right now, given https://dydx.forum/t/winding-down-matic/2937 - there may be a time when mainnet proposal goes live; happy to make a PR for that if/when it happens

Testing

• Toggled statsig dconfig with empty string and non empty string and verified click through / not showing notif if empty string
  • I have it set to an empty string rn here so that we don't think it's already in - feel free to toggle to test

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