(setup cost estimation logs): replace banners with tracing spans

[zeroXbrock]

Motivation

The banners and un-marked logs from the sim running were kinda confusing and clogged up the logs. Using tracing spans will allow us to filter them out if/when we want.

Solution

• remove banners
• add tracing span to TestScenario::estimate_setup_cost; logs are now marked with the prefix simulate_setup_cost

snapshot of the new logs:

PR Checklist

• Added Tests
• Added Documentation
• Ran cargo +nightly clippy --workspace --lib --examples --tests --benches --all-features --locked --fix
• Ran cargo fmt --all
• Note breaking changes in PR description, if applicable
• update changelogs
  • Update CHANGELOG.md in each affected crate
  • add a high-level description in the root changelog