Add tests for the year bundle files

[pjreiniger]

Adds tests for the things bundled into the year json, i.e. 2025.json

• Checks that description and website are populated
• Checks that the file called out exists
• Checks the version in the bundle matches the vendor dep
• Checks that the UUID in the bundle matches the UUID in the vendordep
• Checks that UUID's are unique between vendors (only in the current year, which is probably sufficient)
• Checks that the UUID is consistent across versions
• Checks that the UUID conforms to the python uuid format
• Checks that all files are covered, i.e. that a file added in 2025/XXX.json is in the 2025.json bundle