fix(select): select check additional count event loop (#743)

Fixes select causing the window to be frozen on choosing x amount of
options. This is caused by running `_checkAdditionalItemCount` within
updated for each update instead of listening for selected options only.

Co-authored-by: Aykut Saraç <aykut.sarac@trendyol.com>

src/components/select/bl-select.ts

@@ -488,7 +488,9 @@ export default class BlSelect<ValueType extends FormValue = string> extends Form
  this.value = null;
  }
 
- this._checkAdditionalItemCount();
+ if (_changedProperties.has("_selectedOptions")) {
+ this._checkAdditionalItemCount();
+ }
  }
 
  /**