[#12112] fix(authz): Align group load authorization

[roryqi]

What changes were proposed in this pull request?

• Add an explicit authorization expression for loading group details.
• Include metalake and group path parameters in the authorization metadata context.
• Support GROUP::SELF in JCasbin authorization checks.
• Add regression tests for group load authorization metadata and GROUP::SELF evaluation.

Why are the changes needed?

The group load API should follow the same authorization interception path as related user and group access-control APIs.

Fix: #12112

Does this PR introduce any user-facing change?

No public API change. Group detail loading now follows the expected authorization behavior.

How was this patch tested?

• ./gradlew :server:test --tests org.apache.gravitino.server.web.rest.authorization.TestGroupAuthorizationExpression --tests org.apache.gravitino.server.web.rest.TestGroupOperations
• ./gradlew :server-common:test --tests org.apache.gravitino.server.authorization.jcasbin.TestJcasbinAuthorizer
• git diff --check

[github-actions]

Code Coverage Report

Overall Project	67.71% +0.17%	🟢
Files changed	90.69%	🟢

Module	Coverage
aliyun	1.72%	🔴
api	47.82%	🟢
authorization-common	85.96%	🟢
aws	42.04%	🟢
azure	2.47%	🔴
catalog-common	9.92%	🔴
catalog-fileset	79.77%	🟢
catalog-glue	66.91%	🟢
catalog-hive	79.42%	🟢
catalog-jdbc-common	44.81%	🟢
catalog-jdbc-doris	81.6%	🟢
catalog-jdbc-mysql	79.23%	🟢
catalog-jdbc-postgresql	82.29%	🟢
catalog-jdbc-starrocks	78.51%	🟢
catalog-kafka	77.01%	🟢
catalog-lakehouse-generic	59.18%	🟢
catalog-lakehouse-hudi	79.1%	🟢
catalog-lakehouse-iceberg	85.87%	🟢
catalog-lakehouse-paimon	84.25%	🟢
catalog-model	77.72%	🟢
cli	44.5%	🟢
client-java	78.27%	🟢
common	51.95%	🟢
core	82.51%	🟢
filesystem-hadoop3	77.28%	🟢
flink	0.0%	🔴
flink-common	47.09%	🟢
flink-runtime	0.0%	🔴
gcp	14.12%	🔴
hadoop-auth	68.0%	🟢
hadoop-common	12.7%	🔴
hive-metastore-common	53.4%	🟢
iceberg-common	63.77%	🟢
iceberg-rest-server	74.9%	🟢
idp-basic	86.02%	🟢
integration-test-common	0.0%	🔴
jobs	66.17%	🟢
lance-common	20.67%	🔴
lance-rest-server	64.84%	🟢
lineage	53.02%	🟢
optimizer	83.24%	🟢
optimizer-api	21.95%	🔴
server	85.89% +0.19%	🟢
server-common	76.13% +3.76%	🟢
spark	28.57%	🔴
spark-common	46.01%	🟢
tencent	69.84%	🟢
trino-connector	40.29%	🟢

Files

Module	File	Coverage
server	GroupOperations.java	96.36%	🟢
server-common	JcasbinAuthorizer.java	90.14%	🟢