[SPARK-47599][MLLIB] MLLib: Migrate logWarn with variables to structured logging framework

[panbingkun]

What changes were proposed in this pull request?

The pr aims to migrate logWarn in module MLLib with variables to structured logging framework.

Why are the changes needed?

To enhance Apache Spark's logging system by implementing structured logging.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

• Pass GA.

Was this patch authored or co-authored using generative AI tooling?

No.