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21b03d2ce3
when compiling the tree with clang-19, it complains:
```
/home/kefu/dev/scylladb/service/topology_coordinator.cc:1968:31: error: variable 'reject' set but not used [-Werror,-Wunused-but-set-variable]
1968 | if (auto* reject = std::get_if<join_node_response_params::rejected>(&validation_result)) {
| ^
1 error generated.
```
so, despite that we evaluate the assignment statement to see it
evaluates to true or false, the compiler still believes that the
variable is not used. probably, the value of the statement is not
dependent on the value of the value being assigned. either way,
let's use `std::holds_alternative<..>` instead of `std::get_if<..>`,
to silence this warning, and the code is a little bit more compacted,
in the sense of less tokens in the `if` statement.
in order to be self-contained, we take the opportunity to
include `<variant>` in this source file, as a function declared
in this header is used.
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Closes scylladb/scylladb#18291