Ignore non-Flint index in show and describe index statement

[dai-chen]

Description

This PR introduced changes in Flint index factory which captured any exception occurred during Flint index creation. The invalid index will be ignored and log a warning message as below. Because all SHOW and DESC statement make use of this factory, this should fix the issue for all show and describe statements.

4/03/26 09:58:40 WARN FlintSparkIndexFactory: Failed to create Flint index from metadata
FlintMetadata(0.3.0,,,,[Ljava.util.Map;@4f60ac31,{},{},{},None,None,
Some({"index.creation_date":"1711472320637","index.number_of_replicas":"1","index.number_of_shards":"1",
"index.provided_name":"flint_spark_catalog_invalid_index","index.uuid":"NUWGIPFjQqO_2hn6pF94_w",
"index.version.created":"136277827"}))
scala.MatchError:  (of class java.lang.String)
	at org.opensearch.flint.spark.FlintSparkIndexFactory$.doCreate(FlintSparkIndexFactory.scala:58)
	at org.opensearch.flint.spark.FlintSparkIndexFactory$.create(FlintSparkIndexFactory.scala:44)
	at org.opensearch.flint.spark.FlintSpark.$anonfun$describeIndexes$2(FlintSpark.scala:181)
	at scala.collection.TraversableLike.$anonfun$flatMap$1(TraversableLike.scala:293)

Issues Resolved

#295

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