[#12220] feat(core): Add active deletion schema and models

[nevzheng]

What changes were proposed in this pull request?

This is PR 1 of 2 in the deletion-generation storage stack.

• Add a nullable, unique table_meta.deletion_id pointer for one active table-deletion generation.
• Add a minimal entity_deletion table containing deletion_id, lifecycle state, the fixed retention_expires_at deadline, and an optional purge_job_id.
• Add indexes for retained-root discovery, expiry selection, and purge-job association.
• Add the corresponding persistent-object fields and conversion coverage.
• Add fresh-install and 1.3-to-2.0 upgrade SQL for H2, MySQL, and PostgreSQL.
• Ensure the SQL-script test actually executes discovered upgrade scripts.

This PR deliberately does not add deletion identifiers to table-owned child rows, duplicate table identity in the action, retain terminal receipts, or introduce deletion-specific audit storage.

Stack:

• Parent epic: [EPIC] Add durable deletion-generation storage #12220
• Depends on: none
• Next: [#12220] feat(core): Add active table deletion storage transactions #12223

After this PR, relational storage can represent a retained table root and its minimal active deletion action. It does not yet change DELETE, UNDROP, or purge runtime behavior.

Why are the changes needed?

Soft deletion needs an opaque identifier for each active deletion generation and a fixed recovery deadline. The original table_meta row remains the source of table identity, name, parent, and deletion time, while entity_deletion stores only the short-lived lifecycle and future purge-job association.

Keeping the action minimal avoids duplicating metadata that already belongs to the retained table root and lets a later transaction layer remove the action after either successful restoration or final purge.

Part of #12220

Does this PR introduce any user-facing change?

No. This PR adds relational schema and persistent-object support only. It does not change public APIs or runtime deletion behavior.

How was this patch tested?

./gradlew :core:test \
  --tests org.apache.gravitino.storage.TestSQLScripts \
  --tests org.apache.gravitino.storage.relational.utils.TestPOConverters \
  -PskipITs -PskipDockerTests=true

[github-actions]

Code Coverage Report

Overall Project	67.92% +0.23%	🟢
Files changed	86.27%	🟢

Module	Coverage
aliyun	1.72%	🔴
api	48.1%	🟢
authorization-common	85.96%	🟢
aws	42.04%	🟢
azure	2.47%	🔴
catalog-common	9.92%	🔴
catalog-fileset	79.74%	🟢
catalog-glue	66.91%	🟢
catalog-hive	79.4%	🟢
catalog-jdbc-common	45.7%	🟢
catalog-jdbc-doris	81.8%	🟢
catalog-jdbc-mysql	79.33%	🟢
catalog-jdbc-postgresql	83.39%	🟢
catalog-jdbc-starrocks	79.16%	🟢
catalog-kafka	77.01%	🟢
catalog-lakehouse-generic	59.18%	🟢
catalog-lakehouse-hudi	79.1%	🟢
catalog-lakehouse-iceberg	85.86%	🟢
catalog-lakehouse-paimon	84.23%	🟢
catalog-model	77.72%	🟢
cli	44.5%	🟢
client-java	78.27%	🟢
common	52.07%	🟢
core	82.82% +0.15%	🟢
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	64.65%	🟢
iceberg-rest-server	75.02%	🟢
idp-basic	86.02%	🟢
integration-test-common	0.0%	🔴
jobs	66.17%	🟢
lance-common	20.67%	🔴
lance-rest-server	64.23%	🟢
lineage	53.02%	🟢
optimizer	83.17%	🟢
optimizer-api	21.95%	🔴
server	85.89%	🟢
server-common	76.31%	🟢
spark	28.57%	🔴
spark-common	46.01%	🟢
tencent	69.84%	🟢
trino-connector	40.29%	🟢

Files

Module	File	Coverage
core	POConverters.java	88.28%	🟢
	TablePO.java	72.34%	🟢
	EntityDeletionPO.java	0.0%	🔴