endpoint: fix panic if restored endpoint does no longer exist in k8s #36292
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The blamed commit was intended to silence not found errors during restoration, which are expected if the corresponding pod has been deleted asynchronously while the agent was down. However, it mistakenly modified the execution flow, breaking out of the switch (rather than returning) and eventually leading to accessing a nil pointer, with the obvious ill-fated consequences.
Let's fix this by restoring the original execution flow, and add a dedicated unit test to prevent regressions.
Fixes: 40130c7 ("endpoint: silence metadata resolver not found errors during restoration")