chore(http): remove subscriptions restart endpoint

[yordis]

• Persistent subscription restart already has gRPC management coverage, so keeping the duplicate HTTP route preserves an avoidable programmatic surface.
• Programmatic management should converge on gRPC where parity exists, leaving HTTP for UI, probes, metrics, and documented gaps.

[cursor]

PR Summary

Medium Risk
Removes an existing HTTP management endpoint, which can break clients or tooling that still calls /subscriptions/restart, but does not change persistent-subscription runtime behavior itself.

Overview
Removes the HTTP API surface for restarting persistent subscriptions by deleting the POST /subscriptions/restart route and its RestartPersistentSubscriptions handler from PersistentSubscriptionController.

Updates the Swagger spec (swagger.yaml) to drop the /subscriptions/restart path so it is no longer documented/tested as part of the HTTP API.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 70a945f8-6341-42d7-9f98-57c5daed1f16

📥 Commits

Reviewing files that changed from the base of the PR and between 16282f4 and ba03945.

📒 Files selected for processing (2)

• src/EventStore.Core.Tests/swagger.yaml
• src/EventStore.Core/Services/Transport/Http/Controllers/PersistentSubscriptionController.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch yordis/chore-remove-subscriptions-restart-http

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