CI - cargo test covers all languages

[bfops]

Description of Changes

TODO:

• Exclude the new crates from the typical test invocations

API and ABI breaking changes

Expected complexity level and risk

Testing

TypeScript harness:

• Run the wrapped TypeScript suite:
  • cargo test -p spacetimedb-typescript-tests
• This runs pnpm build, pnpm vitest run with a JUnit report, then pnpm vitest typecheck --run. Reports are written under target/language-tests/typescript/.

C# harness:

• Pre-build the local server binaries before running the full C# harness:
  • cargo build -p spacetimedb-cli -p spacetimedb-standalone --features spacetimedb-standalone/allow_loopback_http_for_tests
• Run the wrapped C# suite:
  • cargo test -p spacetimedb-csharp-tests
• This runs the bindings tests, packs/restores the SDK solution against local NuGet packages, runs the SDK tests, and then runs the C# regression script against a temporary SpacetimeDB server started through spacetimedb-guard. TRX reports are written under target/language-tests/csharp/.