Cleanup old non-$ methods

We still have a few methods on Prisma Client, like .transaction from the pre-$ days. We deprecated these methods already a few sprints ago, so it’s time to clean them up.

[janpio]

This is going to be worked on in the next 2 weeks.

[erawk]

This conflict on prisma.transaction is preventing us from upgrading to 2.11.x. We have a model and table named transaction, so usage of it as say prisma.transaction.aggregate throws type errors:

src/modules/accounts/modelHelpers.ts:40:44 - error TS2339: Property 'aggregate' does not exist on type '{ <TAll>(values: Iterable<TAll | PromiseLike<TAll>>): Promise<TAll[]>; <T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>(values: readonly [T1 | PromiseLike<T1>, T2 | PromiseLike<...>, ... 7 more ..., T10 | PromiseLike<...>]): Promise<...>; <T1, T2, T3, T4, T5, T6, T7, T8, T9>(values: readonly [...]): Promise<...>; <T1, T2, ...'.

40   const { sum } = await prisma.transaction.aggregate({
                                              ~~~~~~~~~

This worked fine in 2.10.x.