Fix Restore-AzSqlDatabase HA replica count default

[Charan Uppuluri (charanuvs)]

Description

Restore-AzSqlDatabase previously assigned the non-nullable HAReplicaCount parameter directly to the nullable request model property. When -HAReplicaCount was omitted, PowerShell's default Int32 value caused highAvailabilityReplicaCount: 0 to be serialized instead of leaving the property unspecified.

This change:

• Sets HighAvailabilityReplicaCount only when -HAReplicaCount is explicitly bound.
• Preserves explicit values, including -HAReplicaCount 0.
• Adds unit coverage for omitted, zero, and nonzero values.

Validation:

• dotnet test src/Sql/Sql.Test/Sql.Test.csproj --no-restore --filter "FullyQualifiedName~Microsoft.Azure.Commands.Sql.Test.UnitTests" (58 total, 56 passed, 2 existing skips)
• dotnet msbuild build.proj /p:Scope=Sql
• dotnet msbuild build.proj /t:StaticAnalysis /p:Scope=Sql

Mandatory Checklist

• Please choose the target release of Azure PowerShell. (⚠️Target release is a different concept from API readiness. Please click below links for details.)

  • General release
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  • Private preview
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  • 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
  • Update src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md.
    • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header in the past tense.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT adjust version of module manually in pull request

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Thank you for your contribution Charan Uppuluri (@charanuvs)! We will review the pull request and get back to you soon.

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[Copilot]

🟡 Changes recommended

Expand “HA” as “high availability (HA)” on first use in the changelog.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Fixes Restore-AzSqlDatabase so omitted HA replica counts remain unspecified while explicit values are preserved.

Changes:

• Conditionally assigns the HA replica count.
• Adds tests for omitted, zero, and nonzero values.
• Updates the SQL changelog.

File summaries

File	Summary
src/Sql/Sql/Database Backup/Cmdlet/RestoreAzureRMSqlDatabase.cs	Handles replica-count parameter binding correctly.
src/Sql/Sql/ChangeLog.md	Documents the behavior fix.
src/Sql/Sql.Test/UnitTests/AzureSqlDatabaseBackupUnitTests.cs	Adds regression coverage.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 1
• Review effort level: Lite

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