### Summary
Refactored the `renderFilesToXml` function to improve performance and
readability by replacing iterative string concatenation with
`Array.map().join()`.
### Changes
- Replaced the `for...of` loop with `files.map(...).join('')`
- Reduced number of string mutation operations
- Preserved the existing XML structure and CDATA safety
### Why
Using `join` avoids repeated string concatenation in loops, which can
improve performance, especially when rendering a large number of files.
It also results in more concise and idiomatic code.
I have read the CLA Document and I hereby sign the CLA
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Let me know if this needs any adjustments!
Signed-off-by: yonatanlavy <yehonatanmind@gmail.com>
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