Use Guid.CreateVersion7

[hishamco]

No description provided.

[gvkries]

I’m not convinced this change provides a meaningful benefit. UUID v7 is only really useful when its ordering characteristics matter, for example in scenarios like database indexes. That does not seem to apply to our usages here, where values such as IDs are typically only consumed via their string representation, so the ordering aspect has no practical effect in our code.

In addition, UUID v7 is not a generic replacement for the version currently produced by Guid.NewGuid(). It trades away some randomness to gain time-ordering, which can make it a worse fit for more general-purpose values, including pseudo-security-sensitive uses such as secrets or tokens.