[BUG] “Failed to remove the module $MODULE” warnings

[antepusic]

Describe the bug

Upon the removal of query modules (e.g. when shutting down Memgraph), warnings such as these are consistently logged:

[2023-04-05 16:35:36.374] [Warning] Failed to remove the module mgp_networkx from sys.modules
[2023-04-05 16:35:36.378] [Warning] Failed to remove the module mgp_igraph from sys.modules
[2023-04-05 16:35:36.428] [Warning] Failed to remove the module igraphalg from sys.modules

To Reproduce

1. Run Memgraph + MAGE
2. Shut down Memgraph and observe the logs in the command line

Expected behavior

All query modules should have been cleanly removed.