Merge #19373: refactor: Replace HexStr(o.begin(), o.end()) with HexStr(o)

bd93e32292c96b671e71223032ff8f660ce27c5d refactor: Replace HexStr(o.begin(), o.end()) with HexStr(o) (Wladimir J. van der Laan)

Pull request description:

  HexStr can be called with anything that bas `begin()` and `end()` functions, so clean up the redundant calls.

  (context: I tried to convert `HexStr` to use span, but this turns out to be somewhat more involved than I thought, because of the limitation to pre-c++17 Span lacking iterator-based constructor) . This commit is a first step which stands on its own though)

ACKs for top commit:
  jonatack:
    ACK bd93e32292c96b671e71223032ff8f660ce27c5d
  troygiorshev:
    ACK bd93e32292c96b671e71223032ff8f660ce27c5d
  MarcoFalke:
    review ACK bd93e32292c96b671e71223032ff8f660ce27c5d 🔌

Tree-SHA512: 7e4c9d0259b8d23271d233095f1c51db1ee021e865361d74c05c10dd5129aa6d34a243323e2b4596d648e2d7b25c7ebdee37a3e4f99a27883cb4c3cd26432b08

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