fix: Event handlers are not handled in multi pod scenario

[hopengfoong]

Description

Work Item ID: AB#58005

In multi pod scenario, when stream or export target state is changed, events are fired. Before this PR, the events are only handled in the "web" cluedin-server. However, it DOES NOT affect the functionality because replica's scheduler checks if the export should be run every minute. This PR is to ensure that the jobs are "removed" immediately rather than waiting for scheduler to run & then NOT add the "export job" and waiting for the export job to "exit" if it's triggered

Existing behaviour

The following two images shows that "web" cluedin-server handles it but the extra replica does not when stream is stopped

"Web"

Replica

New behaviour

The following two images shows that "web" cluedin-server handles it AND the server extra replica handles it too.

"Web"

Replica

How has it been tested?

Locally using homedev with CLUEDIN_SERVER_EXTRA_REPLICAS to 1

Release Note

Notable Changes

[Copilot]

Pull request overview

This PR updates FileStorage connector event handlers to subscribe to the system-wide async event bus instead of the local-only event bus, so events are handled correctly when the connector runs with multiple pods/replicas.

Changes:

• Switched stream-related event handlers from ApplicationContext.System.Events.Local.Subscribe(...) to ApplicationContext.System.Events.SubscribeAsync(...).
• Removed sync wrapper methods that blocked on async work via GetAwaiter().GetResult().

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/Connector.FileStorage.Common/EventHandlers/UpdateStreamEventHandler.cs	Uses async system event subscription to receive stream update events across pods.
src/Connector.FileStorage.Common/EventHandlers/UpdateExportTargetEventHandler.cs	Uses async system event subscription to receive export target updates across pods.
src/Connector.FileStorage.Common/EventHandlers/ChangeStreamStateEventHandler.cs	Uses async system event subscription to receive stream state changes across pods.

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