[Improvement] Complete v2 audit operation mapping coverage

[FANNG1]

What changed

• Added explicit v2 audit mappings for all known OperationType values in CompatibilityUtils
• Expanded AuditLog.Operation with the concrete audit operation values needed by v2
• Added tests to verify:
  • concrete mappings for newly covered operation types
  • all known OperationType values map to a non-unknown audit operation

Why

The previous v2 compatibility mapping only covered part of the listener operation space.
Many supported operations still fell back to UNKNOWN_OPERATION, which made audit output incomplete and inconsistent.

This change makes v2 audit mapping complete for all known operation types and keeps UNKNOWN_OPERATION reserved for truly unknown inputs only.

How it was tested

IT_SPARK_HOME=/Users/fanng/deploy/demo/spark-3.5.3-bin-hadoop3 \
IT_SPARK_ARGS='--conf spark.jars=/Users/fanng/deploy/demo/jars/iceberg-spark-runtime-3.5_2.12-1.9.2.jar,/Users/fanng/deploy/demo/jars/iceberg-aws-bundle-1.9.2.jar --conf spark.sql.extensions=org.apache.iceberg.spark.extensions.IcebergSparkSessionExtensions --conf spark.sql.catalog.rest=org.apache.iceberg.spark.SparkCatalog --conf spark.sql.catalog.rest.type=rest --conf spark.sql.catalog.rest.uri=http://127.0.0.1:9001/iceberg/ --conf spark.sql.catalog.rest.header.X-Iceberg-Access-Delegation=vended-credentials' \
IT_TABLE_IDENTIFIER=rest.ab.a1 \
GRAVITINO_ENV_IT=true \
./gradlew :core:test -PskipIT=true --tests 'org.apache.gravitino.audit.v2.TestCompatibilityUtils'

Risks / follow-ups

• AuditLog.Operation is still shared with legacy audit code, so this change expands the enum surface beyond the legacy formatter coverage.
• If new OperationType values are added later, the new guard test should fail until the mapping is updated.

[github-actions]

Code Coverage Report

Overall Project	65.01% +0.1%	🟢
Files changed	76.92%	🟢

Module	Coverage
aliyun	1.73%	🔴
api	47.14%	🟢
authorization-common	85.96%	🟢
aws	1.1%	🔴
azure	2.6%	🔴
catalog-common	10.0%	🔴
catalog-fileset	80.02%	🟢
catalog-hive	80.98%	🟢
catalog-jdbc-clickhouse	79.06%	🟢
catalog-jdbc-common	42.89%	🟢
catalog-jdbc-doris	80.28%	🟢
catalog-jdbc-hologres	54.03%	🟢
catalog-jdbc-mysql	79.23%	🟢
catalog-jdbc-oceanbase	78.38%	🟢
catalog-jdbc-postgresql	82.05%	🟢
catalog-jdbc-starrocks	78.27%	🟢
catalog-kafka	77.01%	🟢
catalog-lakehouse-generic	45.07%	🟢
catalog-lakehouse-hudi	79.1%	🟢
catalog-lakehouse-iceberg	87.25%	🟢
catalog-lakehouse-paimon	77.71%	🟢
catalog-model	77.72%	🟢
cli	44.51%	🟢
client-java	77.83%	🟢
common	49.42%	🟢
core	81.14% -0.12%	🟢
filesystem-hadoop3	76.97%	🟢
flink	38.86%	🔴
flink-runtime	0.0%	🔴
gcp	14.2%	🔴
hadoop-common	10.39%	🔴
hive-metastore-common	45.82%	🟢
iceberg-common	50.21%	🟢
iceberg-rest-server	66.51%	🟢
integration-test-common	0.0%	🔴
jobs	66.17%	🟢
lance-common	23.88%	🔴
lance-rest-server	57.84%	🟢
lineage	53.02%	🟢
optimizer	82.95%	🟢
optimizer-api	21.95%	🔴
server	85.62%	🟢
server-common	70.14%	🟢
spark	32.79%	🔴
spark-common	39.09%	🔴
trino-connector	31.62%	🔴

Files

Module	File	Coverage
core	OperationType.java	100.0%	🟢
	CompatibilityUtils.java	99.31%	🟢
	AuditLog.java	97.3%	🟢
	GravitinoEnv.java	10.98%	🔴