ci(e2e): run the harness on Node 22, which pnpm 11 requires

[jarvis9443]

#836 moved the e2e job to pnpm 11 but left actions/setup-node on Node 20. pnpm 11 requires Node 22.13 or newer — it imports node:sqlite for its store index — so that combination is only working by accident: this job never reaches the store code path, so the install succeeds. Any pnpm command that does touch the store (pnpm store path, a cache: pnpm step, a future harness change) fails with ERR_UNKNOWN_BUILTIN_MODULE.

That is not hypothetical — it is exactly how the same pnpm bump broke the control plane's dashboard and UI-image jobs, which do run pnpm store path via setup-node's cache: api7/AISIX-Cloud#1172.

GitHub is deprecating Node 20 on its runners anyway; the job logs already warn about it.

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