Shared: Remove the language-specific model generator scripts

[paldepind]

This PR

• Makes it possible to invoke the shared MaD generator script directly and adds a new --language flag that specifies which language to generate models for.
• Removes the language specific scripts.
• Renamed generate_flow_model.py to generate_mad.py. Seems like a slightly nicer name as the script can also generate sinks and sources.

I think this will make it easier to expand on the script in a cross-language way going forward.

The model difference CI job is failing. I think that's because it's trying to use the new script path on the old main, which can't work. I think we can just ignore that?

[Copilot]

Pull Request Overview

This PR consolidates the per-language flow model generator scripts into a single shared generate_mad.py tool with a new --language flag, and removes the language‑specific stubs.

• Refactor misc/scripts/models-as-data/generate_mad.py to handle all languages and add a command‑line entry point.
• Delete each GenerateFlowModel.py under rust/ql, java/ql, csharp/ql, and cpp/ql.
• Update RegenerateModels.py (Java) and the CI workflow to invoke the new script.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
rust/ql/src/utils/modelgenerator/GenerateFlowModel.py	Removed Rust‑specific generator stub.
misc/scripts/models-as-data/generate_mad.py	Refactored to support --language, cleaned imports, added __main__.
java/ql/src/utils/modelgenerator/RegenerateModels.py	Updated to call generate_mad.py with --language java.
java/ql/src/utils/modelgenerator/GenerateFlowModel.py	Removed Java‑specific generator stub.
java/ql/src/change-notes/2025-05-02-mad-generator-renamed.md	Documented removal of old script and new --language requirement.
csharp/ql/src/utils/modelgenerator/GenerateFlowModel.py	Removed C#‑specific generator stub.
csharp/ql/src/change-notes/2025-05-02-mad-generator-renamed.md	Documented removal of old script and new --language requirement.
cpp/ql/src/utils/modelgenerator/GenerateFlowModel.py	Removed C++‑specific generator stub.
.github/workflows/mad_modelDiff.yml	Updated CI to invoke generate_mad.py with --language java.

Comments suppressed due to low confidence (1)

misc/scripts/models-as-data/generate_mad.py:81

• The sys.exit(0) in the language‑not‑specified branch is mis‑indented (it ends up running unconditionally) and exits with a success code. It should be indented inside the else: block alongside the print(), and use a non‑zero exit code (e.g. sys.exit(1)), so that missing --language is treated as an error.

sys.exit(0)

[Copilot]

The CI invocation omits the --with-neutrals flag, but RegenerateModels.py includes it. Add --with-neutrals here to ensure neutral models are generated and compared in the diff job.

Suggested change

	python misc/scripts/models-as-data/generate_mad.py --language java --with-summaries --with-sinks $DATABASE $SHORTNAME/$QL_VARIANT
	python misc/scripts/models-as-data/generate_mad.py --language java --with-summaries --with-sinks --with-neutrals $DATABASE $SHORTNAME/$QL_VARIANT