fix: retry transaction waits after RPC errors

[loglapa]

Fixes #23546

Summary

• keep polling for transaction receipts after transient RPC failures
• keep polling for L1-to-L2 message readiness after transient RPC failures
• cover both wait helpers with regression tests

Testing

• yarn workspace @aztec/aztec.js test utils/node.test.ts utils/cross_chain.test.ts
• yarn build
• yarn format aztec.js
• yarn lint aztec.js

All commands were run in aztecprotocol/devbox:3.0.

[loglapa]

Rebased onto the current merge-train/spartan tip. Validation in aztecprotocol/devbox:3.0: immutable install, full TypeScript build, focused node.test.ts and cross_chain.test.ts suites (23/23), format check, lint, and git diff --check all pass. The repository-wide bootstrap reaches the unchanged ipc-runtime prerequisite and stops because this devbox warns that Rust 1.89.0 is not installed; the yarn-project build and changed tests are green. The failed external check only reports the missing ci-external/ci-external-once label; a maintainer needs to add it because contributors cannot add repository labels.