GH-6499: Explicitly close the socket onStop in electron

[kittaakos]

Otherwise, the channels will be closed with a checkAliveTimeout delay
in the electron application, when refreshing the browser window.

Closes: #6499

Signed-off-by: Akos Kitta kittaakos@typefox.io

What it does

• It explicitly closes the websocket channels in the electron applicationn when the frontend application is stopping. This ensures, any backend resources can be released when the browser window is reloaded/unloaded.
• Alignned the SIW service path: /search-in-workspace -> /services/search-in-workspace.
• Added debug logging when channels are opened and closed.

How to test

I do not have a clean way to verify it, but you can add some logging to backend on JsonRpcProxy#onDidCloseConnection. See #6499.

Review checklist

• as an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• as a reviewer, I agree to behave in accordance with the review guidelines

I am going to verify the behavior on Windows.

[kittaakos]

I am going to verify the behavior on Windows.

It works.

[akosyakov]

I have verified for regression in the browser target. It looks good, the client still can reconnect and i don't see any error like ws channel has been already closed.