feature: move USDN yield in dedicated adapter

[asyx21]

One of the tests is failing with pool id already existing. This seems normal to me as current PR goal is precisely to move USDN pool into its dedicated adapter (smardex-usdn) from its previous one (smardex-amm) to be display in appropriate tab here:
https://defillama.com/protocol/smardex-usdn

Check if pool id already used by other project
      ✕ Print duplicated pool IDs and their existing projects (15 ms)

Pool ID: 0xde17a000BA631c5d7c2Bd9FB692EFeA52D90DEE2 is already used by another project

[asyx21]

Note: SMARDEX_SUBGRAPH_API_KEY is already configured in your backend. But seems like it is not in your test CICDs thus failing the testing suite above.