Expose backup storage redundancy for SQL MI LTR backups

[svmicano]

🤖 PR Validation — ️✔️ All clear

Tests
️✔️ 40/40

Description

Expose the backup storage redundancy type returned by Get-AzSqlInstanceDatabaseLongTermRetentionBackup.

The SQL REST API and generated .NET SDK already return backupStorageRedundancy, but the hand-written Managed Instance LTR PowerShell output model did not define the property and the adapter did not map it. This change adds the output property and maps the existing SDK value.

Related work item: https://msdata.visualstudio.com/Database%20Systems/_workitems/edit/5161960/

Validation performed:

• Confirmed the live REST response returns backupStorageRedundancy with value Geo.
• Added unit coverage for SDK-to-PowerShell model mapping.
• Editor diagnostics reported no errors.
• git diff --check passed.

Not run: module build or unit test execution, per the author's request to approve builds first.

Mandatory Checklist

• Please choose the target release of Azure PowerShell.

  • General release
  • Public preview
  • Private preview
  • Engineering build
  • No need for a release

• Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

• SHOULD update ChangeLog.md file(s) appropriately
• SHOULD regenerate markdown help files if there is cmdlet API change
• SHOULD have proper test coverage for changes in pull request
• SHOULD NOT adjust version of module manually in pull request

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[Aditya Pujara (a0x1ab)]

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[Copilot]

🟢 Approval recommended

The changes are small, consistent with existing patterns, include a targeted unit test, and appear to correctly surface and map the already-returned SDK property.

Pull request overview

This PR exposes the backupStorageRedundancy value returned by the SQL REST API/.NET SDK on the PowerShell output model for Managed Instance LTR backups, so users can see the backup storage redundancy in Get-AzSqlInstanceDatabaseLongTermRetentionBackup results.

Changes:

• Added BackupStorageRedundancy to the Managed Instance LTR backup PowerShell output model.
• Mapped ManagedInstanceLongTermRetentionBackup.BackupStorageRedundancy into the PowerShell model in the adapter.
• Added a unit test validating the SDK-to-PS model mapping and updated the Sql module changelog.

File summaries

File	Description
src/Sql/Sql/ManagedDatabase Backup/Services/AzureSqlManagedDatabaseBackupAdapter.cs	Maps the SDK BackupStorageRedundancy field into the PowerShell output model (and makes mapping callable from unit tests).
src/Sql/Sql/ManagedDatabase Backup/Model/AzureSqlManagedDatabaseLongTermRetentionBackupModel.cs	Adds BackupStorageRedundancy to the output model surfaced to users.
src/Sql/Sql/ChangeLog.md	Documents the user-visible output change under “Upcoming Release”.
src/Sql/Sql.Test/UnitTests/AzureSqlManagedDatabaseBackupAdapterTests.cs	Adds unit coverage to ensure BackupStorageRedundancy is mapped correctly (and validates RG parsing from resource ID).

Review details

• Files reviewed: 4/4 changed files
• Comments generated: 0
• Review effort level: Lite

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