fix(jetbrains): avoid connection loops

[andreafalzetti]

Description

Adds a check to make sure to avoid connecting multiple times to the same workspace. Not having this check in place is causing a loop of connections when trying to open a connection with a workspace that is already opened in another client.

The approach used is to show this message popup while we wait for a new API to request focus to the open IDE.

Related Issue(s)

Fixes #9848

How to test

1. Ensure you have the latest JetBrains Gateway installed.
2. Download the plugin build related to this branch in Dev Versions, and install it on the Gateway.
3. Start a workspace in gitpod.io with any JetBrains IDE as your preferred editor
4. Open the IDE as you normally do
5. Try launching new sessions by clicking on the "Open in IntelliJ" (or GoLand, etc)

Optionally,

1. Open DevTools on the workspace browser page where you have the open in intellij button
2. Simulate quick clicks on the button:

document.querySelectorAll('button')[1].click();
document.querySelectorAll('button')[1].click();
document.querySelectorAll('button')[1].click();

3. Observe how 3 popups open but the main client does not stop or if affected.

Release Notes

Fixed JetBrains connection loop when connecting twice to the same workspace 

Documentation

Werft options:

• /werft with-preview

[werft-gitpod-dev-com]

started the job as gitpod-build-fix-jb-connections-loop-9848.1 because the annotations in the pull request description changed
(with .werft/ from main)

[andreafalzetti]

/werft run with-clean-slate-deployment

👍 started the job as gitpod-build-fix-jb-connections-loop-9848.13
(with .werft/ from main)

[andreafalzetti]

/werft run with-clean-slate-deployment

👍 started the job as gitpod-build-fix-jb-connections-loop-9848.22
(with .werft/ from main)

[andreafalzetti]

/werft run with-clean-slate-deployment with-large-vm

👍 started the job as gitpod-build-fix-jb-connections-loop-9848.23
(with .werft/ from main)

[akosyakov]

code-wise it looks great

/hold

@felladrin Could you help with testing please? 🙏

[felladrin]

Code reviewed and tested! ✅

Detection was really fast! Worked for all cases I tested.

[andreafalzetti]

thanks folks 🙏

/unhold