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What does this change?
Update TypeScript to v5.3.3 to align with @guardian/commercial.
Fixing all peer dependencies became a thread pulling exercise of also updating: @guardian packages, eslint, babel, react, jest etc and fixing ensuing TS, babel and jest issues.
There's probably more upgrades we could do but this PR just fixes all peer deps and resulting errors from the TS upgrade.
The client side code in Frontend is mostly deprecated, it only runs on pages that Frontend still renders and the commercial codebase still runs on (primarily tag pages, video, audio and galleries atm).
Checklist