test: run HTTP/2 test suite on Deno and Bun

[pi0x]

In test/node.test.ts the HTTP/2 test configurations are skipped entirely when running under Deno or Bun:

for (const config of testConfigs) {
  if ((isDeno || isBun) && config.http2) {
    continue; // Not implemented yet in Deno, Bun fails somehow too!
  }

The Node-compat HTTP/2 server path (node: { http2: true, allowHTTP1: false }) is currently only exercised on Node. On Deno it is not implemented yet, and on Bun the suite fails for reasons not yet root-caused. This issue tracks getting the HTTP/2 configs to run (or documenting a hard limitation) on Deno and Bun so the runtime carve-out can be removed.

Tracked as part of the v1 stabilization docs/test-hygiene batch (link skips to issues).