Connect to a running DevWorkspace with the JetBrains Client from the Dashboard

[azatsarynnyy]

https://issues.redhat.com/browse/CRW-5677

This PR complements my previous one #19 with the following:

• login information from the local .kube/config is used, so the user doesn't need to care about it on each Gateway start
• port-forwarding is enabled automatically using the code from the PR https://github.com/redhat-developer/devspaces-gateway-plugin/pull/16/files
• Gateway main window is hidden
• system tray icon is added for quick disconnect and adding more commands in the future

[github-actions]

Qodana Community for JVM

12 new problems were found

Inspection name	Severity	Problems
Unused import directive	🔶 Warning	3
Unstable API Usage	🔶 Warning	3
Convert to primary constructor	🔶 Warning	1
Incorrect string capitalization	🔶 Warning	1
Usage of redundant or deprecated syntax or deprecated symbols	🔶 Warning	1
Redundant nullable return type	🔶 Warning	1
Redundant empty primary constructor	◽️ Notice	2

💡 Qodana analysis was run in the pull request mode: only the changed files were checked

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