ci: add unused-using-decls to clang-tidy

Summary:
This way we will not forget to remove using statements after we stop using the object.

This is a backport of core#25466

Test Plan:

cmake .. -GNinja -DBUILD_CHRONIK=1 -DENABLE_CLANG_TIDY=ON -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++
ninja all check bitcoin-fuzzers bitcoin-bench

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D18663