hooks: ContainerList failure in removePreStartHookContainers aborts compose down teardown

[glours]

This issue was filed by an AI agent on a human's behalf. The human submitter may not have independently verified the report.

In removePreStartHookContainers (down.go, introduced in PR #14091), a ContainerList error returns early and causes the whole down() to return an error, leaving networks and volumes unremoved. The call should warn-and-continue (matching the removal-failure behaviour below it) rather than aborting teardown.

Mentioned in #14091 review by @ndeloof (down.go:419).

[glours]

Closing: opened by an AI agent without explicit authorization.