fix(bundling): rspack should allow ES config module imports

[meeroslav]

Reproduction repo: https://github.com/olaf-cichocki/sample

Current Behavior

When using mjs config file we end up with following error:

⚠️ Unable to construct project graph.
Failed to process project graph. Run "nx reset" to fix this. Please report the issue if you keep seeing it.
Failed to process project graph. Run "nx reset" to fix this. Please report the issue if you keep seeing it.
      An error occurred while processing files for the @nx/rspack/plugin plugin.
    - apps/appA/rspack.config.mjs: require() of ES Module /Users/miro/Dev/Testbox/sample/apps/appA/rspack.config.mjs not supported.
  Instead change the require of /Users/miro/Dev/Testbox/sample/apps/appA/rspack.config.mjs to a dynamic import() which is available in all CommonJS modules.
      Error [ERR_REQUIRE_ESM]: require() of ES Module /Users/miro/Dev/Testbox/sample/apps/appA/rspack.config.mjs not supported.
      Instead change the require of /Users/miro/Dev/Testbox/sample/apps/appA/rspack.config.mjs to a dynamic import() which is available in all CommonJS modules.
          at resolveUserDefinedRspackConfig (/Users/miro/Dev/Testbox/sample/node_modules/.pnpm/@[email protected]_@[email protected]_@[email protected]_react-dom@1_7iwdcl66l7me4m7pewq22wegge/node_modules/@nx/rspack/src/utils/resolve-user-defined-rspack-config.js:19:16)
          at createRspackTargets (/Users/miro/Dev/Testbox/sample/node_modules/.pnpm/@[email protected]_@[email protected]_@[email protected]_react-dom@1_7iwdcl66l7me4m7pewq22wegge/node_modules/@nx/rspack/src/plugins/plugin.js:65:98)
          at createNodesInternal (/Users/miro/Dev/Testbox/sample/node_modules/.pnpm/@[email protected]_@[email protected]_@[email protected]_react-dom@1_7iwdcl66l7me4m7pewq22wegge/node_modules/@nx/rspack/src/plugins/plugin.js:51:34)
          at async /Users/miro/Dev/Testbox/sample/node_modules/.pnpm/[email protected]/node_modules/nx/src/project-graph/plugins/utils.js:10:27
          at async Promise.all (index 0)

Expected Behavior

Using EU module config files is supported

Related Issue(s)

Fixes #

Thank you @olaf-cichocki for reporting the issue.

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[Coly010]

This changes the function to return a Promise in some circumstances.

That's going to impact how this function is used in config.ts and plugin.ts.