Cancellable: add safer APIs to check the token

[auduchinok]

There're cases where reading an assembly metadata may happen outside of the type checking routine. For example, computing code completion suggestions or Parameter Info signature may trigger reading of types that haven't been imported during the checking. We want to be able to check if the metadata reading is happening inside a Cancellable context and to check for interruptions in a safer way.

[github-actions]

❗ Release notes required

---

✅ Found changes and release notes in following paths:

Change path	Release notes path	Description
src/Compiler	docs/release-notes/.FSharp.Compiler.Service/9.0.200.md

[auduchinok]

There's a failing test in the macOS run:

FSharp.Compiler.Service.Tests.BuildGraphTests.Many requests to get a value asynchronously might evaluate the computation more than once even when some requests get canceled

It doesn't seem related to the changes in this PR.

[majocha]

There's a failing test in the macOS run:

FSharp.Compiler.Service.Tests.BuildGraphTests.Many requests to get a value asynchronously might evaluate the computation more than once even when some requests get canceled

It doesn't seem related to the changes in this PR.

Yes, unrelated: #18115

[auduchinok]

Another unrelated failure:

/Users/runner/hostedtoolcache/dotnet/sdk/9.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(417,5): error MSB4018: The "GenerateRuntimeConfigurationFiles" task failed unexpectedly. [/Users/runner/work/1/s/buildtools/fslex/fslex.fsproj]
/Users/runner/hostedtoolcache/dotnet/sdk/9.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(417,5): error MSB4018: System.IO.IOException: The process cannot access the file '/Users/runner/work/1/s/artifacts/bin/fslex/Debug/net9.0/osx-x64/fslex.runtimeconfig.json' because it is being used by another process. [/Users/runner/work/1/s/buildtools/fslex/fslex.fsproj]
/Users/runner/hostedtoolcache/dotnet/sdk/9.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(417,5): error MSB4018:    at Microsoft.Win32.SafeHandles.SafeFileHandle.Init(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Int64& fileLength, UnixFileMode& filePermissions) [/Users/runner/work/1/s/buildtools/fslex/fslex.fsproj]
/Users/runner/hostedtoolcache/dotnet/sdk/9.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(417,5): error MSB4018:    at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, UnixFileMode openPermissions, Int64& fileLength, UnixFileMode& filePermissions, Boolean failForSymlink, Boolean& wasSymlink, Func`4 createOpenException) [/Users/runner/work/1/s/buildtools/fslex/fslex.fsproj]
/Users/runner/hostedtoolcache/dotnet/sdk/9.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(417,5): error MSB4018:    at System.IO.Strategies.OSFileStreamStrategy..ctor(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable`1 unixCreateMode) [/Users/runner/work/1/s/buildtools/fslex/fslex.fsproj]
/Users/runner/hostedtoolcache/dotnet/sdk/9.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(417,5): error MSB4018:    at System.IO.File.Create(String path) [/Users/runner/work/1/s/buildtools/fslex/fslex.fsproj]
/Users/runner/hostedtoolcache/dotnet/sdk/9.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(417,5): error MSB4018:    at Microsoft.NET.Build.Tasks.GenerateRuntimeConfigurationFiles.WriteToJsonFile(String fileName, Object value) [/Users/runner/work/1/s/buildtools/fslex/fslex.fsproj]
/Users/runner/hostedtoolcache/dotnet/sdk/9.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(417,5): error MSB4018:    at Microsoft.NET.Build.Tasks.GenerateRuntimeConfigurationFiles.WriteRuntimeConfig(RuntimeFramework[] runtimeFrameworks, LockFileTargetLibrary platformLibrary, Boolean isFrameworkDependent, IList`1 packageFolders) [/Users/runner/work/1/s/buildtools/fslex/fslex.fsproj]
/Users/runner/hostedtoolcache/dotnet/sdk/9.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(417,5): error MSB4018:    at Microsoft.NET.Build.Tasks.GenerateRuntimeConfigurationFiles.ExecuteCore() [/Users/runner/work/1/s/buildtools/fslex/fslex.fsproj]
/Users/runner/hostedtoolcache/dotnet/sdk/9.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(417,5): error MSB4018:    at Microsoft.NET.Build.Tasks.TaskBase.Execute() [/Users/runner/work/1/s/buildtools/fslex/fslex.fsproj]
/Users/runner/hostedtoolcache/dotnet/sdk/9.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(417,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Execute() [/Users/runner/work/1/s/buildtools/fslex/fslex.fsproj]
/Users/runner/hostedtoolcache/dotnet/sdk/9.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(417,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(TaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask) [/Users/runner/work/1/s/buildtools/fslex/fslex.fsproj]
    0 Warning(s)
    1 Error(s)

[github-actions]

Failed to run : https://github.com/dotnet/fsharp/actions/runs/12481264245

[auduchinok]

It's green now 🙂