Update dependency Microsoft.Data.SqlClient to v7

[dependencyupdates]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Microsoft.Data.SqlClient (source)	6.1.4 → 7.0.0

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Release Notes

dotnet/sqlclient (Microsoft.Data.SqlClient)

v7.0.0

This section summarizes all changes across the 7.0 preview cycle for users upgrading from the latest 6.1 stable release.
See the full release notes for detailed descriptions.

Also released as part of this milestone:

• Released Microsoft.Data.SqlClient.Extensions.Abstractions 1.0.0. See release notes.
• Released Microsoft.Data.SqlClient.Extensions.Azure 1.0.0. See release notes.
• Released Microsoft.Data.SqlClient.Internal.Logging 1.0.0. See release notes.
• Released Microsoft.Data.SqlClient.AlwaysEncrypted.AzureKeyVaultProvider 7.0.0. See release notes.

Changed

• Breaking: Removed Azure dependencies from the core package. Entra ID authentication (ActiveDirectoryAuthenticationProvider and related types) has been extracted into a new Microsoft.Data.SqlClient.Extensions.Azure package. The core Microsoft.Data.SqlClient package no longer depends on Azure.Core, Azure.Identity, or their transitive dependencies. Applications using Entra ID authentication must now install Microsoft.Data.SqlClient.Extensions.Azure separately.
  (#​1108,
  #​3680,
  #​3902,
  #​3904,
  #​3908,
  #​3917,
  #​3982,
  #​3978,
  #​3986)

• Two additional packages were introduced to support this separation: Microsoft.Data.SqlClient.Extensions.Abstractions (shared types between the core driver and extensions) and Microsoft.Data.SqlClient.Internal.Logging (shared ETW tracing infrastructure).
  (#​3626,
  #​3628,
  #​3967,
  #​4038)

• Deprecated SqlAuthenticationMethod.ActiveDirectoryPassword (ROPC flow). The method is now marked [Obsolete] and will generate compiler warnings. Migrate to ActiveDirectoryInteractive, ActiveDirectoryServicePrincipal, ActiveDirectoryManagedIdentity, or ActiveDirectoryDefault.
  (#​3671)

• Reverted public visibility of internal interop enums (IoControlCodeAccess and IoControlTransferType) that were accidentally made public during the project merge.
  (#​3900)

• Removed Constrained Execution Region error handling blocks and associated SqlConnection cleanup.
  (#​3535)

• Performance improvements across SqlStatistics timing, Always Encrypted scenarios, and connection opening:
  (#​3609,
  #​3612,
  #​3732,
  #​3660,
  #​3791,
  #​3772,
  #​3554)

• Allow SqlBulkCopy to operate on hidden columns.
  (#​3590)

• Updated UserAgent feature to use a pipe-delimited format, replacing the previous JSON format.
  (#​3826)

• Minor improvements to Managed SNI tracing to capture continuation events and errors.
  (#​3859)

Added

• Added SspiContextProvider abstract class and SqlConnection.SspiContextProvider property, enabling custom SSPI authentication for scenarios like cross-domain Kerberos negotiation and NTLM username/password authentication.
  (#​2253,
  #​2494)

• Continued refinement of packet multiplexing with bug fixes and stability improvements, plus new app context switches for opt-in control.
  (#​3534,
  #​3537,
  #​3605)

• Added support for enhanced routing, a TDS feature that allows the server to redirect connections to a specific server and database during login, enabling Azure SQL Hyperscale read replica load balancing.
  (#​3641,
  #​3969,
  #​3970,
  #​3973)

• Updated pipelines and test suites to compile the driver using the .NET 10 SDK.
  (#​3686)

• Added SqlConfigurableRetryFactory.BaselineTransientErrors static property exposing the default transient error codes list as a ReadOnlyCollection<int>.
  (#​3903)

• Added app context switch Switch.Microsoft.Data.SqlClient.EnableMultiSubnetFailoverByDefault to set MultiSubnetFailover=true globally without modifying connection strings.
  (#​3841)

• Added app context switch Switch.Microsoft.Data.SqlClient.IgnoreServerProvidedFailoverPartner to let the client ignore server-provided failover partner info in Basic Availability Groups.
  (#​3625)

• Enabled SqlClientDiagnosticListener for SqlCommand on .NET Framework, closing a long-standing observability gap where diagnostic events were previously only available on .NET Core.
  (#​3658)

• Brought the 15 strongly-typed diagnostic event classes in the Microsoft.Data.SqlClient.Diagnostics namespace (e.g., SqlClientCommandBefore, SqlClientConnectionOpenAfter, SqlClientTransactionCommitError) to .NET Framework as part of the codebase merge. These types were originally introduced for .NET Core in 6.0.
  (#​3493)

• Enabled User Agent Feature Extension (opt-in via Switch.Microsoft.Data.SqlClient.EnableUserAgent).
  (#​3606)

• Added actionable error message when Entra ID authentication methods are used without the Microsoft.Data.SqlClient.Extensions.Azure package installed.
  (#​3962,
  #​4046)

Fixed

• Fixed a connection performance regression where SPN generation was triggered for non-integrated authentication modes (e.g., SQL authentication) on the native SNI path.
  (#​3929)

• Fixed ExecuteScalar to propagate errors when the server sends data followed by an error token.
  (#​3912)

• Fixed NullReferenceException in SqlDataAdapter when processing batch scenarios.
  (#​3857)

• Fixed reading of multiple app context switches from a single AppContextSwitchOverrides configuration field.
  (#​3960)

• Fixed an edge case in TdsParserStateObject.TryReadPlpBytes where zero-length reads returned null instead of an empty array.
  (#​3872)

• Fixed issue where extra connection deactivation was occurring.
  (#​3758)

• Fixed debug assertion in connection pool (no impact to production code).
  (#​3587)

• Prevented uninitialized performance counters escaping CreatePerformanceCounters.
  (#​3623)

• Fixed SetProvider to return immediately if user-defined authentication provider found.
  (#​3620)

• Fixed connection pool concurrency issue.
  (#​3632)

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