chore: updates contract tests CI to also test FDv2 cases

[tanderson-ld]

Note

Enables FDv2 contract tests in CI and adds DataSystem initializer/synchronizer config support to the contract test service.

• CI
  • Update .github/actions/contract-tests/action.yml to accept run_fdv2_tests input and, when true, set up Go, launch service, clone sdk-test-harness feat/fdv2, and run FDv2 tests.
  • Pass run_fdv2_tests: 'true' in .github/workflows/sdk-server-ci.yml.
• Contract Test Service
  • Extend Representations.cs with SdkConfigDataSystemParams model (store, mode, initializers, synchronizers, polling/streaming params, constants).
  • In SdkClientEntity.cs, wire up DataSystem initializers and synchronizers via Components.DataSystem(); add required usings. (Persistent store wiring left commented out.)
• Tests
  • Add pkgs/sdk/server/contract-tests/test-supressions-fdv2.txt for FDv2-specific skips.
• Assembly
  • Grant internals access to ContractTestService in AssemblyInfo.cs.

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