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d9f721baf3
Running the 5000 tables scenario using tablets following Scylla warnings appeared:
```
2026-02-23T23:18:31.903 schema-scale-tablets-5000t-2026-1-db-node-77930459-4 !WARNING | scylla[5208] [shard 1:sl:d] seastar_memory - oversized allocation: 655360 bytes. This is non-fatal, but could lead to latency and/or fragmentation issues. Please report: at 0x320cf9f 0x320cba0 0x1826a28 0x2fb8f97 0x180340e 0x447855e 0x4461c5a 0x161c3c6 0x161c4b3 0x161e9b7 0x551f43c 0x54df6ca /opt/scylladb/libreloc/libc.so.6+0x72463 /opt/scylladb/libreloc/libc.so.6+0xf55ab
seastar::current_backtrace_tasklocal() at ./build/release/seastar/./seastar/include/seastar/util/backtrace.hh:85
seastar::current_tasktrace() at ./build/release/seastar/./build/release/seastar/./seastar/src/util/backtrace.cc:136
seastar::current_backtrace() at ./build/release/seastar/./build/release/seastar/./seastar/src/util/backtrace.cc:169
seastar::memory::cpu_pages::warn_large_allocation(unsigned long) at ./build/release/seastar/./build/release/seastar/./seastar/src/core/memory.cc:865
seastar::memory::allocate_slowpath(unsigned long) at ./build/release/seastar/./build/release/seastar/./seastar/src/core/memory.cc:928
cql3::statements::(anonymous namespace)::tables(data_dictionary::database const&, seastar::lw_shared_ptr<data_dictionary::keyspace_metadata> const&, std::optional<bool>) [clone .resume] at ././seastar/src/core/memory.cc:1727
std::__n4861::coroutine_handle<seastar::internal::coroutine_traits_base<std::vector<cql3::description, std::allocator<cql3::description> > >::promise_type>::resume() const at /usr/lib/gcc/x86_64-redhat-linux/15/../../../../include/c++/15/coroutine:247
```
This patch replaces the use of `std::vector<description>` with `utils::chunked_vector`
to prevent the large allocation.
Fixes: SCYLLADB-2388
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
Closes scylladb/scylladb#30146
(cherry picked from commit d4d43213f6)
Closes scylladb/scylladb#30218