test_ping_application_loop and test_ping_multi_node test failures

[sanity]

In current main branch:

CARGO_TARGET_DIR=~/cargo_target_dir cargo test

Resulted in:

test test_ping_application_loop ... FAILED

failures:

---- test_ping_multi_node stdout ----

thread 'test_ping_multi_node' panicked at apps/freenet-ping/app/tests/run_app.rs:644:13:
error: anyhow::Error - Failed to read contract code

---- test_ping_application_loop stdout ----

thread 'test_ping_application_loop' panicked at apps/freenet-ping/app/tests/run_app.rs:1029:13:
error: anyhow::Error - Failed to read contract code
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    test_ping_application_loop
    test_ping_multi_node

test result: FAILED. 0 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 12.24s