Don't used named exports when exporting in ES Module format.

[manbearwiz]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix

What is the current behavior?

Currently, setting "libraryTarget": "module" emits the following error:

Error: Library name must be unset. Common configuration options that specific library names are 'output.library[.name]', 'entry.xyz.library[.name]', 'ModuleFederationPlugin.name' and 'ModuleFederationPlugin.library[.name]'.

What is the new behavior?

The error is no longer emitted.

Does this PR introduce a breaking change?

• No

[arturovt]

Tests are failing. Could you have a look?

[manbearwiz]

I noticed the failing e2e tests when I first made the PR. Those tests run inconsistently on my machine for main so I assumed this was an unrelated issue. Have you seen this before? I only ask because this change really only effect projects with "libraryTarget": "module" which doesn't include the e2e test projects.