[akrem-chabchoub]

Adds a corrupt-chunk check that puts an invalid chunk (neither CAC nor SOC) into a node's reserve, restarts the node, and verifies whether the chunk is kept or removed.

Steps

1. Pick a full node. Its data must be on a persistent volume (persistence-enabled: true).
2. Build an invalid chunk: random bytes under a random address, stamped with a real postage batch.
3. Switch the node's StatefulSet to import-image, a Bee build at 7515c4c5 (the commit before #5640, whose reserve does not validate chunk types). It runs bee db import reserve to write the chunk.
4. Restart the node with restart-image (the original image if empty).
5. GET /chunks/: served means the chunk was kept, not found means it was removed. Compare with expect-removed.
6. Always restore the original StatefulSet.