[EgorBo]

Enrolls the Microsoft.* libraries and their tests in unsafe-v2 for net11.0 and later and applies the output of the migration driver, one commit per project, untouched.

• Enrollment: MemorySafetyRulesVersion=2 for net11.0+ in 43 libraries and 44 test project files. net10.0 and older keep the legacy rules: the LibraryImportGenerator in those targeting packs stamps unsafe on generated types, an unfixable CS9377 under the new rules. Microsoft.Bcl.* is not included.
• Driver output: 12 libraries and 7 test projects needed changes; the rest build as is. No public or protected member requires unsafe.
• AllowUnsafeBlocks: Microsoft.Extensions.Configuration.EnvironmentVariables and Microsoft.Extensions.Hosting.Functional.Tests opt in.
• Tooling, separate commits: UnsafeMigrationFixAllProvider merges each fix as one minimal edit (a conflict used to silently drop every fix in a file), and UnsafeContextPlanner gets the block-first ordering from Enroll System.IO.Compression and its tests in unsafe-v2 #136657 without its test updates. Drop that commit once Enroll System.IO.Compression and its tests in unsafe-v2 #136657 lands.

Enrolled assemblies (43)

• Microsoft.CSharp
• Microsoft.Extensions.Caching.Abstractions
• Microsoft.Extensions.Caching.Memory
• Microsoft.Extensions.Configuration
• Microsoft.Extensions.Configuration.Abstractions
• Microsoft.Extensions.Configuration.Binder
• Microsoft.Extensions.Configuration.CommandLine
• Microsoft.Extensions.Configuration.EnvironmentVariables
• Microsoft.Extensions.Configuration.FileExtensions
• Microsoft.Extensions.Configuration.Ini
• Microsoft.Extensions.Configuration.Json
• Microsoft.Extensions.Configuration.UserSecrets
• Microsoft.Extensions.Configuration.Xml
• Microsoft.Extensions.DependencyInjection
• Microsoft.Extensions.DependencyInjection.Abstractions
• Microsoft.Extensions.DependencyInjection.Specification.Tests
• Microsoft.Extensions.DependencyModel
• Microsoft.Extensions.Diagnostics
• Microsoft.Extensions.Diagnostics.Abstractions
• Microsoft.Extensions.FileProviders.Abstractions
• Microsoft.Extensions.FileProviders.Composite
• Microsoft.Extensions.FileProviders.Physical
• Microsoft.Extensions.FileSystemGlobbing
• Microsoft.Extensions.Hosting
• Microsoft.Extensions.Hosting.Abstractions
• Microsoft.Extensions.Hosting.Systemd
• Microsoft.Extensions.Hosting.WindowsServices
• Microsoft.Extensions.Http
• Microsoft.Extensions.Logging
• Microsoft.Extensions.Logging.Abstractions
• Microsoft.Extensions.Logging.Configuration
• Microsoft.Extensions.Logging.Console
• Microsoft.Extensions.Logging.Debug
• Microsoft.Extensions.Logging.EventLog
• Microsoft.Extensions.Logging.EventSource
• Microsoft.Extensions.Logging.TraceSource
• Microsoft.Extensions.Options
• Microsoft.Extensions.Options.ConfigurationExtensions
• Microsoft.Extensions.Options.DataAnnotations
• Microsoft.Extensions.Primitives
• Microsoft.Win32.Registry
• Microsoft.Win32.Registry.AccessControl
• Microsoft.Win32.SystemEvents

Related: #131451 (tracking), #136664 (enrollment tracking), #136621 (infrastructure), #136657 (System.IO.Compression).

Blocked by #136657 (has to be merged first).

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