Avoid including source map file in app's binary

[fluiddot]

Internal ref: pcdRpT-5rI-p2#comment-9518

To test:

• Observe that the XCFramework artifact is generated properly.
• Follow testing instructions from WP-iOS PR.

PR submission checklist:

• [ ] I have considered adding unit tests where possible.
• [ ] I have considered if this change warrants user-facing release notes more info and have added them to RELEASE-NOTES.txt if necessary.