Toggeling FEEL for `FeelCheckboxEntry` focuses the value as well

[marstamm]

Describe the Bug

When using a FeelCheckboxEntry or FeelToggleSwitchEntry, when I click on the toggle switch, it focuses the Button that will be replaced.

This is because the Button is part of the label, which has default browser behavior.

Steps to Reproduce

1. Click on the FEEL toggle, multiple times if necessary
2. It focuses/toggles the checkbox as well

Expected Behavior

There is a clear distinction between FEEL toggle and checkbox toggle, e.g. by moving the button out of the label tag.

Reported here: camunda/camunda-modeler#4154 (comment)
related to camunda/camunda-modeler#3622

Environment

• Host (Browser/Node version), if applicable: [e.g. MS Edge 18, Chrome 69, Node 10 LTS]
• OS: [e.g. Windows 7]
• Library version: [e.g. 2.0.0]