[Pipe] Allow startup when a plugin JAR is unavailable - #18496
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Description
When ConfigNode cannot provide a registered Pipe plugin JAR, DataNode startup currently fails. This change records the affected plugin load failures, logs them at ERROR, skips unavailable plugins, and allows DataNode startup to continue.
The fetch path now also handles unsuccessful or malformed ConfigNode responses, validates the returned JAR count, and isolates individual JAR save failures. The recorded failure remains visible through SHOW PIPEPLUGINS.
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