Show cancelling workflow state immediately

[aidevelopers2]

Summary

• add a Cancelling workflow sub-status for accepted cancellation requests
• persist non-finished workflow instances as Running / Cancelling before dispatching background cancellation work
• keep the existing cancellation pipeline responsible for the final transition to Cancelled
• update the API client enum and cover the immediate state persistence/dispatch behavior with unit tests

Fixes #5187

Tests

• .nuke/temp/dotnet-unix/dotnet test test/unit/Elsa.Workflows.Runtime.UnitTests/Elsa.Workflows.Runtime.UnitTests.csproj --filter WorkflowCancellationServiceTests

[greptile-apps]

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[Copilot]

Pull request overview

Adds an intermediate Cancelling workflow sub-status so cancellation requests are reflected immediately (before background cancellation completes), improving UI/API consistency during bulk cancellation operations.

Changes:

• Introduce WorkflowSubStatus.Cancelling in core and API client enums.
• Persist non-finished workflow instances as Running/Cancelling (including WorkflowState) before dispatching cancellation work.
• Add unit tests covering the save-before-dispatch behavior and the “instance not found” path.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/unit/Elsa.Workflows.Runtime.UnitTests/Services/WorkflowCancellationServiceTests.cs	Verifies instances are persisted as Cancelling before dispatch and that missing instances do not dispatch.
src/modules/Elsa.Workflows.Runtime/Services/WorkflowCancellationService.cs	Marks cancellable instances as Running/Cancelling and saves them before dispatching cancellation requests.
src/modules/Elsa.Workflows.Core/Enums/WorkflowSubStatus.cs	Adds the Cancelling sub-status to the core enum.
src/modules/Elsa.Workflows.Core/Contexts/WorkflowExecutionContext.cs	Maps Cancelling to main Running status for execution-context status derivation.
src/clients/Elsa.Api.Client/Resources/WorkflowInstances/Enums/WorkflowSubStatus.cs	Adds Cancelling to the API client enum to keep it in sync with server responses.