Regenerate test lcm for cap 71 (stellar#5293)

# Description

Regenerate test lcm for cap 71 and add copilot instructions

<!---

Describe what this pull request does, which issue it's resolving
(usually applicable for code changes).

--->

# Checklist
- [ ] Reviewed the
[contributing](https://github.com/stellar/stellar-core/blob/master/CONTRIBUTING.md#submitting-changes)
document
- [ ] Rebased on top of master (no merge commits)
- [ ] Ran `clang-format` v8.0.0 (via `make format` or the Visual Studio
extension)
- [ ] Compiles
- [ ] Ran all tests
- [ ] If change impacts performance, include supporting evidence per the
[performance
document](https://github.com/stellar/stellar-core/blob/master/performance-eval/performance-eval.md)

Author: sisuresh