Make clippy _a little_ more annoying (#10570)

* Clippy: +complexity

* Update client/cli/src/arg_enums.rs

Co-authored-by: Bastian Köcher <[email protected]>

* Update bin/node/inspect/src/lib.rs

Co-authored-by: Bastian Köcher <[email protected]>

* Update primitives/keystore/src/testing.rs

Co-authored-by: Bastian Köcher <[email protected]>

* Update frame/elections/src/lib.rs

Co-authored-by: Keith Yeung <[email protected]>

* Update primitives/npos-elections/fuzzer/src/reduce.rs

Co-authored-by: Keith Yeung <[email protected]>

* Incorporating feedback

* No need for Ok

* Additional

* Needed slice

* Wigy's suggestions on less derefs

* fix count

* reverting changes brought in by option_map_unit_fn

* add --all-targets

Co-authored-by: Bastian Köcher <[email protected]>
Co-authored-by: Keith Yeung <[email protected]>