[gRPC migration] Phase 4 — Migrate node-internal tests' transaction building/transport JSON-RPC → gRPC

[Thoralf-M]

Part of the gRPC transaction-building migration epic #12096. Covers the tests
that use JSON-RPC only as transport to exercise node internals. The
JSON-RPC API-surface tests are handled separately in #12103.

Goal

Migrate transaction building (and, where they only use JSON-RPC as a client
transport, the reads) in node-internal test suites to the gRPC-driven
TransactionBuilder, without changing what is under test. These stay
#[sim_test].

tonic-under-msim — RESOLVED

PR #11819 deferred sim-test migration for lack of a "tonic-under-msim
precedent". That precedent already exists: crates/iota-e2e-tests/tests/grpc/
is driven entirely by the gRPC client under the simulator (~120 #[sim_test],
verified). gRPC works under msim, so node-behaviour tests can move
JSON-RPC → gRPC and stay deterministic simtests.

Scope

• crates/iota-e2e-tests/tests/ node-internal suites that use JSON-RPC as
  transport (reconfiguration, protocol_version, full_node,
  transaction_orchestrator, traffic_control, abstract_account, …)
  — ~103 #[sim_test] + ~16 tokio. Migrate transaction building to the
  gRPC builder; keep them as simtests.
• Remaining iota-cluster-test test cases still using
  client.transaction_builder().

Out of scope

• JSON-RPC API-surface tests → [gRPC migration] Phase 6 — Consolidate JSON-RPC API-surface tests onto the indexer backend (remove node iota-json-rpc-tests) #12103 (consolidate onto the indexer,
  remove node iota-json-rpc-tests).
• CLI/tooling test suites (iota/tests/cli_tests.rs, localnet,
  source-validation) — migrate after the tools themselves move off node
  JSON-RPC (Phases 3 & 5).
• JSON-arg move calls — stay on the JSON-RPC client (the SDK builder takes
  typed PTBArgumentList, not JSON args).

Acceptance

• Node-internal tests build transactions via the gRPC client and remain
  #[sim_test]; subjects under test are unchanged.