Tests refactoring: grid list element

[alla-blinkova]

Should be done AFTER #4964 and #4950 are completed.

1. Check JDI-Light framework part, if control implemented correctly,

• Ensure that all the required methods and variables are implemented in the control for it to function correctly in tests.
• Check if all the remaining functionality is working properly.

2. Tests should be added to cover features:

• cols: number
• gutterSize: string
• rowHeight: string | number
• colspan: number
• rowspan: number

Existing tests should be updated to use the new implementation of "grid list" element.

3. Verify the correct design and functioning of all existing tests.

• Perform this check after the implementation is completed.