feat: migrate to makefile and add deduplicate task

[SethFalco]

Deduplicate Files

Adds a build step to delete duplicate files, a test suite doesn't need these.

Quality of Life

• Migrates the script over to a Makefile for easier maintenance.
• Splits the script over multiple commands, so each can be run independently.
• Adds --no-clobber to wget commands to avoid redownloading the archives if we already have them locally. (Doesn't impact CI, run make clean if you specifically want to fetch archives again.)
• Adds CI task on PR to try and build the archive, so we can see if it builds succesfully on GitHub before merging.

Related

• Closes Remove duplicates before creating artifact #1 (Added contributor as co-author.)