Get mux tile tests working again

[mmcgee-jump]

Looks like these broke during the mux tile reworking to serve as other tile infrastructure. Need to fix them up and enable them in the CI scriping.

test_mux_ipc_full test_mux_ipc_meta

https://github.com/firedancer-io/firedancer/pull/748/files#diff-8f517f2294038c13f5f9d78ab5aee289d80e975b702dbc55b40886f6b88f6c09R45