Refactor TraceLinker methods to avoid direct member variable updates for better testability

[TaekyungHeo]

Summary

Refactor TraceLinker methods to avoid direct member variable updates for better testability

Test Plan

$ pip install .             
Processing /Users/theo/chakra
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Installing backend dependencies ... done
  Preparing metadata (pyproject.toml) ... done
Requirement already satisfied: protobuf==4.* in /Users/theo/venv/lib/python3.10/site-packages (from chakra==0.0.4) (4.23.4)
Requirement already satisfied: graphviz in /Users/theo/venv/lib/python3.10/site-packages (from chakra==0.0.4) (0.20.1)
Requirement already satisfied: networkx in /Users/theo/venv/lib/python3.10/site-packages (from chakra==0.0.4) (3.2.1)
Requirement already satisfied: pydot in /Users/theo/venv/lib/python3.10/site-packages (from chakra==0.0.4) (2.0.0)
Requirement already satisfied: pyparsing>=3 in /Users/theo/venv/lib/python3.10/site-packages (from pydot->chakra==0.0.4) (3.1.1)
Building wheels for collected packages: chakra
  Building wheel for chakra (pyproject.toml) ... done
  Created wheel for chakra: filename=chakra-0.0.4-py3-none-any.whl size=51577 sha256=c947bc9a2f6e7a1cd9c8eb07e60f700b5d798354be4be624026df569bc32439a
  Stored in directory: /private/var/folders/z0/c9mq5j4s6n14n0_gs7nlt6mc0000gp/T/pip-ephem-wheel-cache-wtx2s89q/wheels/fa/dc/75/2163b4163bf1e9cf3c7f1cf69fa03716fb707b8c4f5cb271e8
Successfully built chakra
pyInstalling collected packages: chakra
  Attempting uninstall: chakra
    Found existing installation: chakra 0.0.4
    Uninstalling chakra-0.0.4:
      Successfully uninstalled chakra-0.0.4
Successfully installed chakra-0.0.4

$ python3 ci_tools/integration_tests.py --tgz_path tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05.tgz --num_ranks 8 --tolerance 0.05 --expected_times_ms 14597 14597 14968 14638 14649 14700 14677 14735
Extracting tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05.tgz to tests/data/1.0.2-chakra.0.0.4
Running command: chakra_trace_link --pytorch-et-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_host_et_0.json --kineto-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/kineto_0.json --output-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_et_plus_0.json
Running command: chakra_trace_link --pytorch-et-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_host_et_1.json --kineto-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/kineto_1.json --output-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_et_plus_1.json
Running command: chakra_trace_link --pytorch-et-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_host_et_2.json --kineto-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/kineto_2.json --output-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_et_plus_2.json
Running command: chakra_trace_link --pytorch-et-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_host_et_3.json --kineto-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/kineto_3.json --output-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_et_plus_3.json
Running command: chakra_trace_link --pytorch-et-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_host_et_4.json --kineto-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/kineto_4.json --output-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_et_plus_4.json
Running command: chakra_trace_link --pytorch-et-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_host_et_5.json --kineto-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/kineto_5.json --output-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_et_plus_5.json
Running command: chakra_trace_link --pytorch-et-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_host_et_6.json --kineto-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/kineto_6.json --output-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_et_plus_6.json
Running command: chakra_trace_link --pytorch-et-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_host_et_7.json --kineto-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/kineto_7.json --output-file tests/data/1.0.2-chakra.0.0.4/llama_pytorch24.05/chakra_et_plus_7.json

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