Fails to read ESLint settings if packages haven't been installed

[JoshuaKGoldberg]

🐛 Bug Report

• tslint-to-eslint-config version: 0.6.0
• ESLint version: N/A
• Node version: N/A

Actual Behavior

Logging the eslint loaded in findOriginalConfigurations gives:

 Error: Command failed: eslint --print-config "./.eslintrc.js"
  Error: Failed to load parser '@typescript-eslint/parser' declared in '.eslintrc.js': Cannot find module '@typescript-eslint/parser'
  Require stack:
  - C:\Code\sample-tslint-to-eslint-comment\.eslintrc.js
      at Function.Module._resolveFilename (internal/modules/cjs/loader.js:610:15)
      at Function.resolve (internal/modules/cjs/helpers.js:21:19)
      at Object.resolve (C:\Users\Dioge\AppData\Roaming\npm\node_modules\eslint\lib\shared\relative-module-resolver.js:44:50)
      at ConfigArrayFactory._loadParser (C:\Users\Dioge\AppData\Roaming\npm\node_modules\eslint\lib\cli-engine\config-array-factory.js:870:45)
      at ConfigArrayFactory._normalizeObjectConfigDataBody (C:\Users\Dioge\AppData\Roaming\npm\node_modules\eslint\lib\cli-engine\config-array-factory.js:665:32)
      at _normalizeObjectConfigDataBody.next (<anonymous>)
      at ConfigArrayFactory._normalizeObjectConfigData (C:\Users\Dioge\AppData\Roaming\npm\node_modules\eslint\lib\cli-engine\config-array-factory.js:596:20)
      at _normalizeObjectConfigData.next (<anonymous>)
      at createConfigArray (C:\Users\Dioge\AppData\Roaming\npm\node_modules\eslint\lib\cli-engine\config-array-factory.js:340:25)
      at ConfigArrayFactory.loadInDirectory (C:\Users\Dioge\AppData\Roaming\npm\node_modules\eslint\lib\cli-engine\config-array-factory.js:433:16)

Expected Behavior

If there already exists an ESLint file, its packages may be required to determine which output rules are necessary (for example, in #412).

Reproduction

The second time tslint-to-eslint-config is run, it'll try to read the already-generated .eslintrc.js, and fail.

git clone https://github.com/KingDarBoja/sample-tslint-to-eslint-comment
cd sample-tslint-to-eslint-comment
tslint-to-eslint-config
tslint-to-eslint-config 

[JoshuaKGoldberg]

Educated guess: in findOriginalConfigurations, right now:

// Other configuration errors only halt the program if the user asked for them

Configuration errors that include Cannot find module should probably also halt the program.