Rust: backport src/test/test_rust.sh from master

Preparation for 26497.

src/test/test_rust.sh

 #!/bin/sh
-# Test all the Rust crates we're using
+# Test all Rust crates
 
-crates=tor_util
+set -e
 
-exitcode=0
+export LSAN_OPTIONS=suppressions=${abs_top_srcdir}/src/test/rust_supp.txt
 
-for crate in $crates; do
-    cd "${abs_top_srcdir:-.}/src/rust/${crate}"
-    CARGO_TARGET_DIR="${abs_top_builddir}/src/rust/target" CARGO_HOME="${abs_top_builddir}/src/rust" "${CARGO:-cargo}" test ${CARGO_ONLINE-"--frozen"} || exitcode=1
+for cargo_toml_dir in "${abs_top_srcdir:-../../..}"/src/rust/*; do
+    if [ -e "${cargo_toml_dir}/Cargo.toml" ]; then
+	cd "${cargo_toml_dir}" && \
+	    CARGO_TARGET_DIR="${abs_top_builddir:-../../..}/src/rust/target" \
+	    CARGO_HOME="${abs_top_builddir:-../../..}/src/rust/.cargo" \
+	    "${CARGO:-cargo}" test ${CARGO_ONLINE-"--frozen"} \
+	    ${EXTRA_CARGO_OPTIONS} \
+	    --manifest-path "${cargo_toml_dir}/Cargo.toml" || exitcode=1
+    fi
 done
 
 exit $exitcode