RPCs that return detailed information about mempool entries (e.g. getmempoolentry and getrawmempool(verbose=True) include the fields fee, modifiedfee, descendantfees, and ancestorfees which were marked as "DEPRECATED" and replaced with a fees object field in #12240 (since v0.17).

We should remove these fields, but first, properly deprecate them using -deprecatedrpc.

Useful skills:

• basic understanding of Bitcoin Core RPC interface

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