License header is missing in free-solid-svg-icons@6.6.0/index.mjs #20368

[yadavshubham01]

I understand that:

• I'm submitting this PR for reference only. It shows an example of what I'd like to see changed but
  I understand that it will not be merged and I will not be listed as a contributor on this project.

This PR addresses the issue of missing license text in the index.mjs file for the @fortawesome/free-solid-svg-icons package, as outlined in issue #20368

How I solve this Issue:
Updated index.mjs: Added the necessary license comments to ensure proper attribution, complying with MIT and CC BY licenses.
Modified Rollup Configuration: Ensured that the build process retains the license comments without using Terser for minification, preserving the license visibility in the output.
Tested Build Process: Successfully built the project to confirm that the license text is now included in the final output.

[yadavshubham01]

please review this PR @tagliala @robmadole

[tagliala]

Hi @yadavshubham01, thanks for this PR and your willing to help

As mentioned in the contributing guidelines, this PR can't be merged and I'm not even confident that this approach will work in the upstream repository, because the code you are seeing here is being generated

Let's see how @robmadole wants to address this issue with new .mjs files