Un-register extension between steps to prevent cascading test failures

[tsmarvin]

PR Summary

• Add getRegisteredExtensions method to extension client to allow listing all registered extensions.
• Update ensureEditorServicesIsConnected test method to un-register the extension if its already registered to prevent cascading test failures.

PR Checklist

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[Copilot]

Pull Request Overview

This PR prevents cascading test failures by ensuring that any previously registered extension is unregistered before a new registration occurs.

• Adds a new getRegisteredExtensions method to the extension client.
• Updates the test to loop over registered extensions and unregister any that match the target extension ID.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
test/utils.ts	Updated test logic to unregister a pre-registered extension.
src/features/ExternalApi.ts	Added getRegisteredExtensions to expose registered extensions.
src/extension.ts	Extended the client wrapper to include the new getRegisteredExtensions method.

Comments suppressed due to low confidence (1)

test/utils.ts:85

• The variable name '_name' is ambiguous. Consider renaming it to 'uuid' or 'extensionKey' to better convey its purpose.

    for (const [

[Copilot]

[nitpick] There is an unnecessary semicolon after the for loop block; removing it would improve code readability.

Suggested change

	};
	}