Add build_actions ExecuteParams fixture for tvm_executor

[awnion]

Summary

Adds a tvm_executor test fixture that builds ExecuteParams to mirror the acki-nacki build_actions.rs executor path.

The fixture covers both regular and tvm_tracing branches, explicitly sets all ExecuteParams fields, and documents fields that intentionally keep the build_actions.rs default behavior.

Details

• Adds BuildActionsExecuteParamsFixture
• Covers debug / trace_callback regular vs tracing behavior
• Propagates node-relevant fields including signature_id, wasm cache fields, mvconfig, and engine_version
• Uses a full ExecuteParams struct literal so new fields force fixture updates at compile time
• Updates existing executor tests to reuse the fixture instead of hand-building simplified params

Validation

• cargo test -p tvm_executor --lib
• cargo test -p tvm_executor --lib build_actions