This refactoring improves the API by:

1. Making the "not found" case explicit with a boolean rather than a special error
2. Consolidating related information into a single ContainerInfo struct

Changes:

• modify LookupByContainerID to return (ContainerInfo, bool, error) instead of (PodInfo, string, error)
• Replace PodInfo struct with ContainerInfo that includes container name
• Remove ErrNoPod error, use boolean flag to indicate found/not found

For more context ... returning found/not-found follows the go idiom of returning bool if an item ins't found instead of returning error
E.g. from docs ..

os.LookupEnv -  func LookupEnv(key string) (value string, ok bool)
sync.Map.Load - func (m *Map) Load(key any) (value any, ok bool)
strings.Cut - string splitting: -   func Cut(s, sep string) (before, after string, found bool)