Move some of the slowest tests from jest to vitest (#34277)

* Remove doubled-up I18n Provider. ModalManager already provides this.

* Reconfigure svgr into a vite-friendly `?react` resource query

* Move InviteDialog test to vitest

* Move RoomHeader tests to Vitest

* Share serializer between Jest & Vitest

* Attempt to stabilise InviteDialog test

* Fix async leaks

* Iterate based on copilot review

* Fix InviteDialog throttle

* Iterate

* Apply suggestions from code review

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Fix lockfile

* Iterate

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Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

apps/web/package.json

@@ -209,6 +209,7 @@
         "testcontainers": "^12.0.0",
         "typescript": "catalog:ts6",
         "util": "^0.12.5",
+        "vite-plugin-svgr": "catalog:",
         "vitest": "catalog:",
         "vitest-canvas-mock": "^1.1.4",
         "web-streams-polyfill": "^4.0.0",