feat: add surfpool auto-download and enable surfpool for all tests

[ananas-block]

1. Add surfpool as default test validator replacement via --use-surfpool CLI flag (default: true,
   --no-use-surfpool for solana-test-validator)
2. Add surfpool binary auto-download and version management (ensureSurfpoolBinary, version pinned to
   v1.0.1-light)
3. Add getSurfpoolArgs() builder that maps --bpf-program, --upgradeable-program, and --account-dir flags
   to surfpool CLI args
4. Add warp_to_slot() to LightClient using surfpool's surfnet_timeTravel RPC for instant slot advancement
   in tests
5. Fix killProcess() to exclude own PID and parent PID, preventing SIGKILL of parent shell; fix
   spawnBinary() to close inherited FDs and call unref()
6. Update killTestValidator() to also kill surfpool processes and fall back to port-based kill
7. Update spawn_validator() in Rust client to wait for CLI completion when using surfpool (instead of
   fire-and-forget)
8. Pass Photon --start-slot from surfpool's first available block so indexer starts from the correct slot
9. Migrate 18 JS e2e test files from getTestRpc(lightWasm) to createRpc(), removing WasmFactory and
   TestRpc dependencies because surfpool getTransactionSignatures doesnt return more than 30 signatures
10. Replace slot-polling loops with warp_to_slot() in forester tests (compressible ctoken, compressible
    pda, batched state async indexer)

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch jorrit/feat-add-surfpool

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