Add bazelbuild-rules_rust and tinyjson to soong_integration_tests

aosp/2709668 registers Bazel repos using these directories so we need to symlink them for soong integration tests to pass.

Test: build/soong/tests/bp2build_bazel_test.sh
Change-Id: I8ee7e5c702bd0bfa24eb3778371f497a67bf815a