Changing the default dedupe statuses behavior

[sophiatev]

Summary

Currently, only terminal statuses are reusable when creating a new orchestration with a given instance ID. This is enforced when creating the OrchestrationIdReusePolicy, which ensures that only terminal statuses are considered "reusable" (minus whatever statuses the user includes in the dedupe statuses passed to the creation call). This PR allows all statuses to be reusable, with the assumption that the server-side implementation will terminate an existing orchestration if it is running, pending, or suspended (in a non-terminal status) before creating a new one. This is a breaking change for which all server-side implementations will need to be updated accordingly:

1. This PR addresses the WebJobs implementation for the DF use-case.
2. DTS will need to be updated for the standalone SDK use-case to add the termination logic. However, the current backend implementation already does not allow creating a new orchestration if one exists in a non-terminal status, so changing the client-side implementation will not "break" anything until then.
3. Dapr sidecar, which forks this repo so it should be fine?

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Project checklist

• Release notes are not required for the next release
  • Otherwise: Notes added to release_notes.md
• Backport is not required
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• All required tests have been added/updated (unit tests, E2E tests)
• Breaking change?
  • If yes:
    • Impact: See summary
    • Migration guidance:

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[Copilot]

Pull request overview

This PR changes the default behavior for orchestration ID reuse policies to allow all orchestration statuses to be reusable, rather than just terminal statuses. This is a breaking change that assumes server-side implementations will terminate existing orchestrations in non-terminal states before creating new ones with the same instance ID.

Changes:

• Renamed GetTerminalStatuses() to GetAllStatuses() and expanded it to include non-terminal statuses (Pending, Running, Suspended)
• Modified ConvertDedupeStatusesToReusePolicy() to return non-nullable policy and work with all statuses instead of just terminal ones
• Updated all unit tests to reflect the new behavior and removed tests that validated non-terminal status filtering
• Updated comments in server-side code to reflect the new semantics

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 9 comments.

File	Description
src/Client/Grpc/ProtoUtils.cs	Renamed method to GetAllStatuses, added non-terminal statuses, changed return type to non-nullable, updated logic to handle all statuses
src/Client/Grpc/GrpcDurableTaskClient.cs	Refactored dedupe status handling using collection expressions, removed conditional policy assignment logic
src/InProcessTestHost/Sidecar/Grpc/TaskHubGrpcServer.cs	Updated comment to reflect "all statuses" instead of "terminal statuses"
test/Client/Grpc.Tests/ProtoUtilsTests.cs	Comprehensive test updates including renamed tests, updated assertions for all statuses, removed non-terminal filtering tests, added tests for new statuses