Temporarily use vanilla pgbench and psql (client) for running pgvector benchmark #8422
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Problem
#8275 is not yet fixed
Periodic benchmarking fails with SIGABRT in pgvector step, see https://github.com/neondatabase/neon/actions/runs/9967453263/job/27541159738#step:7:393
Summary of changes
Instead of using pgbench and psql from Neon artifacts, download vanilla postgres binaries into the container and use those to run the client side of the test.
TODO: this PR should be reverted when #8275 is fixed