Backport to branch(3.13) : 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 3.13-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. The primary change introduces a check in the dropNamespace method for both JDBC and Cosmos storage implementations to verify that all tables in a namespace are managed by ScalarDB (i.e., have metadata entries) before allowing the namespace to be dropped.

Key changes:

• Added abstract methods deleteMetadata() and dropTable() to AdminTestUtils for test utilities
• Implemented namespace drop validation in JdbcAdmin and CosmosAdmin to check for non-ScalarDB tables
• Added a new error code NAMESPACE_WITH_NON_SCALARDB_TABLES_CANNOT_BE_DROPPED for the validation failure
• Added integration test dropNamespace_ForNamespaceWithNonScalarDBManagedTables_ShouldThrowIllegalArgumentException() to verify the new behavior

Reviewed Changes

Copilot reviewed 28 out of 28 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() to support testing namespace drop validation
DistributedStorageAdminIntegrationTestBase.java	Added test case for dropping namespaces with non-ScalarDB managed tables
JdbcAdmin.java	Added validation logic to check for non-ScalarDB tables before dropping namespace
CosmosAdmin.java	Added validation logic to check for non-ScalarDB tables before dropping namespace
RdbEngineStrategy.java	Added getTableNamesInNamespaceSql() method to RDB engine interface
RdbEngine*.java	Implemented getTableNamesInNamespaceSql() for each database engine
CoreError.java	Added new error code for namespace drop validation failure
*AdminTestUtils.java	Implemented deleteMetadata() and dropTable() methods in all test utility classes
*AdminIntegrationTest.java	Added getAdminTestUtils() implementation and disabled SQLite/DynamoDB tests where namespace concept doesn't apply
*AdminTestBase.java	Updated test mocks to support the new namespace validation logic

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