Merge all reports into one.

[YashKumarVerma]

Currently, the report generated is in form of separate files, write a function that checks if the file for a particular repository exists, and if it does, append data into that file as a new key in the object.

[yashkumarverma-assistant]

Thanks @YashKumarVerma, for raising the issue! 🙌
One of our team mates will revert on this soon. ✅