[AutoTuner] Fix metadata.json regression #3108
                
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This pull request updates the
BaseAlgoEvalSmokeTestclass intools/AutoTuner/test/smoke_test_algo_eval.pyto introduce the concept of aflow_variantfor better configurability and reuse. The changes primarily focus on refactoring thesetUpmethod and related commands to use this new variable.Refactoring for
flow_variantintegration:flow_variantwith the default value"smoke-test-algo-eval"to represent the flow variant. ([tools/AutoTuner/test/smoke_test_algo_eval.pyR47-R55](https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts/pull/3108/files#diff-63a772b287b174f31b4335be42c7e910f197140112906da7b1bb169517dfacf8R47-R55))setUpmethod to useflow_variantin constructing theexperimentname and thereferencefile path, improving flexibility and consistency. ([tools/AutoTuner/test/smoke_test_algo_eval.pyR47-R55](https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts/pull/3108/files#diff-63a772b287b174f31b4335be42c7e910f197140112906da7b1bb169517dfacf8R47-R55))make_basemethod to includeFLOW_VARIANTin allmakecommands, ensuring that the flow variant is explicitly passed to the build system. ([tools/AutoTuner/test/smoke_test_algo_eval.pyL71-R79](https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts/pull/3108/files#diff-63a772b287b174f31b4335be42c7e910f197140112906da7b1bb169517dfacf8L71-R79))