feat: Improve @CascadingUpdateShadowVariable logic

[zepfred]

This pull request enhances the logic of the shadow variable @CascadingUpdateShadowVariable. The new approach eliminates the need to define sources and automatically runs the listener at the end of the events lifecycle.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
73.8% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud