Avoid hardcoding table and repository names in Spring integration tests generator

[EgorkaKulikov]

Description

Current implementation of Spring integration testing has the following lines:

// TODO properly detect which repositories need to be cleared, right now "orders" is hardcoded
val sql = "TRUNCATE TABLE orders"

Expected behavior

We need to avoid hardcode and obtain table and repository names from stateBefore.thisInstance.utAutowiredModel.repoContent

[IlyaMuravjov]

This is a bit less straightforward, because here we need table name and in repoContent there's only bean name. So either here or when creating repoContent we need to determine table names by inspecting corresponding @Entity annotation.

[alisevych]

Already done #2274