So all the cookies that you are seeing are related to your Prismic domain, that is the Dashboard. These cookies are only in the browser of logged in Prismic users, so it doesn’t effect your end users or performance and are not on your website itself. You can test this by visiting your website in incognito mode you will see that they aren’t there.
We do this through the Prismic toolbar, which requests any cookies coming from YOUR Prismic domain (i.e. https://your-repo-name.prismic.io/documents/). This is why some of those other cookies, GA, Hotjar etc. appear also, even though they are only relevant to your Prismic domain.
As for Safari, that is correct it blocks third party cookies and is something that we discuss in our Preview Troubleshooting document as this causes Previews to break in Safari.
Hopefully this answers your questions. If you have any further questions just let me know.