Deduplicate system test entries in tests.yaml

[PranjalManhgaye]

Summary

This PR addresses #767 by reducing duplication in " tools/tests/tests.yaml" , We use YAML anchors and aliases for tutorial entries that appear in multiple test suites. The resolved test configuration stays the same, but the file becomes shorter and easier to maintain when we need to update shared tutorial entries later.

What changed

• Added YAML anchors for repeated tutorial entries.
• Replaced duplicated entries with YAML aliases.
• Kept the same test suites, tutorial paths, case combinations, and reference result paths.

Why

Before this change, we had the same tutorial entries repeated in several suites. If we wanted to update one shared entry later, we would have to remember to update every copy. With this change, we define the repeated entries once and reuse them where needed. This should make future maintenance simpler without changing how the system tests behave.

Validation

I checked that this only changes the YAML structure, not the resolved test configuration.
Ran locally:
bash
git diff --check python3 -m compileall tools/tests python3 tools/tests/systemtests.py --help
I also compared the parsed tests.yaml against upstream/develop; both resolved to the same 13 test suites and 37 tutorial entries.

Checklist:

• I added a summary of any user-facing changes (compared to the last release) in the changelog-entries/<PRnumber>.md.
• I will remember to squash-and-merge, providing a useful summary of the changes of this PR.