@electron-forge/plugin-webpack fails tests due to deprecated mocha.opts

[tjquillan]

Preflight Checklist

• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project follows, as appropriate.
• I have searched the issue tracker for a bug that matches the one I want to file, without success.

Issue Details

• Electron Forge Version:
  • 6.0.0-beta.54
  • master
• Electron Version:
  • N/A
• Operating System:
  • Arch Linux x64
• Last Known Working Electron Forge version::
  • Presumably before 83bfe97

Expected Behavior

Running bolt test while in electron-forge/packages/plugin/webpack runs its tests

Actual Behavior

Running bolt test while in electron-forge/packages/plugin/webpack fails. This is because the test command for webpack still uses the deprecated --opts ../../../mocha.opts argument (additinally that file was removed in 83bfe97).

To Reproduce

• Follow https://github.com/electron-userland/electron-forge/blob/master/CONTRIBUTING.md#changing-the-code
• cd into electron-forge/packages/plugin/webpack
• run bolt test

Additional Information

Test Command: mocha --require ts-node/register test/**/*_spec.ts test/**/**/*_spec.ts --opts ../../../mocha.opts

Error:

✖ ERROR: --opts: configuring Mocha via 'mocha.opts' is DEPRECATED and no longer supported.
          Please use a configuration file instead.
error Error
error     at ChildProcess.<anonymous> (/home/iboyperson/.local/share/yarn/global/node_modules/bolt/dist/modern/utils/processes.js:128:16)
error     at ChildProcess.emit (node:events:327:20)
error     at maybeClose (node:internal/child_process:1048:16)
error     at Process.ChildProcess._handle.onexit (node:internal/child_process:288:5)