Kefu Chai 24d14b601b treewide: s/boost::adaptors::map_values/std::views::values/ ...

now that we are allowed to use C++23. we now have the luxury of using
`std::views::values`.

in this change, we:

- replace `boost::adaptors::map_values` with `std::views::values`
- update affected code to work with `std::views::values`
- the places where we use `boost::join()` are not changed, because
  we cannot use `std::views::concat` yet. this helper is only
  available in C++26.

to reduce the dependency to boost for better maintainability, and
leverage standard library features for better long-term support.

this change is part of our ongoing effort to modernize our codebase
and reduce external dependencies where possible.

Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>

Closes scylladb/scylladb#21265

2024-10-27 21:32:45 +02:00

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