fix: resolve command generation regressions from the typespec toolchain upgrade

[huiii99]

The vendored typespec upgrade (compiler 1.13 / azure-core 0.69) introduced several code-generation regressions. Most visibly, az network application-gateway ssl-cert create failed to load with a SyntaxError, and regenerated commands silently lost their argument customizations. This PR fixes the underlying causes and adds tests.

fixes: https://github.com/Azure/CLIPS/issues/526 & #562

Note: the frontend/emitter changes (convertor.ts, brower-host.ts) require a rebuild (pnpm build:typespec && pnpm build:web && pnpm bundle) since the bundled src/aaz_dev/ui output is not committed. The Python fixes take effect on an editable install with a backend restart.

[necusjz]

tsp is missing some info from previous swagger, e.g.,
tsp,

swagger,

we can see,

1. the content of each parameter group is different
2. the "hidden" info is missed.