Idea: Reuse t3 apps by running a git reset --hard

[andreifilip123]

Currently, one of the weak-points of this is the bandwidth and git.
I'm thinking that if we would create all necessary apps, we could them reuse them for other diffs by resetting the git state in both repos.

E.g. We have 6.5.1..6.5.2-prisma-trpc.
This creates 6.5.1-prisma-trpc and 6.5.2-prisma-trpc.
If after generating the diff instead of deleting them we just reset the state in both folders, we might be able to reuse them

However, this will for sure introduce some big concurrency issues that in the end might not be worth doing.
Also, since GHA is ephemeral, it won't be of use there but locally (unless we cache it in GHA)