[suggestion] - adjust eslint no-unused-vars rule to allow override

[ppanthony]

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"@typescript-eslint/no-unused-vars": [
          "error",
          {
            "argsIgnorePattern": "^_",
            "varsIgnorePattern": "^_",
            "caughtErrorsIgnorePattern": "^_"
          }
        ],

occasionally there are instances where no unused variables is too aggressive. I tend to use underscores in front of a variable name to do this.