Investigate if we can shrink the cves.json and notices.json endpoint payloads

[albertkol]

Summary

At the moment we are sending detailed payloads of each CVE and Notice. Perhaps sending the detailed data should be done just in the single CVE/Notice endpoint, while the get multiple CVE/Notice endpoints keeps everything general.

This should improve the performance of those endpoints too, as we wouldn't have to load as much information in the memory.

We'd have to discuss this with Security and UA-fix team, to make sure the approve it.