Backport to branch(3.14) : Fix to avoid deleting non ScalarDB tables when dropping namespaces

[feeblefakie]

This is an automated request for a manual backport of the following:

• Original PR: Fix to avoid deleting non ScalarDB tables when dropping namespaces #3092
• Commit to backport: 024172e

1. Resolve any conflicts that occur during the cherry-picking process.

git fetch origin &&
git checkout 3.14-pull-3092 &&
git cherry-pick --no-rerere-autoupdate -m1 024172e8a650f26bfc3019642932e0d3424c303b

2. Push the changes.
3. Merge this PR after all checks have passed.

Thank you!

[Copilot]

Pull Request Overview

This PR adds validation to prevent dropping namespaces that contain non-ScalarDB managed tables. When dropNamespace() is called, the system now checks for tables that exist in the underlying storage but lack ScalarDB metadata, throwing an IllegalArgumentException if any are found.

Key changes:

• Added deleteMetadata() and dropTable() methods to AdminTestUtils and implementations to support testing scenarios with non-managed tables
• Implemented namespace validation in JdbcAdmin and CosmosAdmin to check for non-ScalarDB tables before dropping
• Added database-specific SQL queries to retrieve table names from the underlying storage via getTableNamesInNamespaceSql() method in RDB engine strategies

Reviewed Changes

Copilot reviewed 26 out of 26 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
AdminTestUtils.java	Added abstract methods deleteMetadata() and dropTable() for test utilities
DistributedStorageAdminIntegrationTestBase.java	Added integration test for namespace drop validation and abstract method to get admin test utils
JdbcAdmin.java	Implemented namespace validation logic using getInternalTableNames() before dropping
CosmosAdmin.java	Implemented namespace validation using getRawTableNames() before dropping with exception re-throw
CoreError.java	Added new error message for namespace with non-ScalarDB tables
RdbEngineStrategy.java	Added getTableNamesInNamespaceSql() method to strategy interface
RdbEngine*.java	Implemented database-specific SQL queries for each RDB engine (MySQL, PostgreSQL, Oracle, SQL Server, SQLite)
*AdminTestUtils.java	Implemented deleteMetadata() and dropTable() methods for each storage adapter
*AdminIntegrationTest.java	Added getAdminTestUtils() implementation and test overrides for database-specific behavior
JdbcAdminTestBase.java	Updated mocks to support the new table names query in dropNamespace tests
CosmosAdminTestBase.java	Added unit test for namespace drop validation with non-ScalarDB tables

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