Update storage for tests

[grantkee]

• update e2e tests to increase speed and reliability
  • Global panic::set_hook cross-contamination → replaced with Drop guards
  • Fragile last_pause epoch-wait logic → proper poll-until-change loops
  • Stale endpoint after node restart in test_epoch_sync → update endpoint after restart
  • epochs.rs Arc<Mutex> pattern → simplified to ProcessGuard::take()/replace()
  • reduces per-HDX-file from ~130MB to ~1.3MB (99% reduction). Two files per epoch = ~2.6MB instead of ~260MB
  • handle null rpc responses and retry: eth_getBlockByNumber returns null for blocks not yet synced. call_rpc deserializes to HashMap<String, Value> which fails on null. The retry loop only caught RPC transport errors, not successful null responses
• test all rpc transports (https, ws, and ipc)
• always log e2e tests (overwritten each time)
• update rust and clippy versions