runfix: address small ui fixes design review (WPB-9694)

[V-Gira]

WPB-9694 Fix smaller UI issues in the new navigation

Description

• use the same Icon Button for the "add group" icon as the other title bar buttons
• Rotates the arrow Icon when opening/closing the folders

Screenshots/Screencast (for UI changes)

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud