Fix Multi-select Pill Remove

[abhi3315]

Description

The pill removal button isn't working because the addEventListener added to the remove button in tp-multi-select-pill is added in the constructor instead of connectedCallback. The constructor is called when the pill is created, but that instance doesn't include the remove button as a child. As a result, no addEventListener is attached to the pill remove button.

Solutions

I see two possible solutions:

• Move the addEventListener code to the connectedCallback. But the other web components don't follow this and all the addEventListener are added directly to the constructor. To keep it consistent I followed the second approach
• Attach the event listener to the button manually while creating the pill element.