In the future, when testing WASM UDFs, we will only store the Rust
source codes of them, and compile them to WASM. To be able to
do that, we need rust standard library for the wasm32-wasi target,
which is available as an RPM called rust-std-static-wasm32-wasi.
Closes#12896
[avi: regenerate toolchain]
Closes#13258