[Code health] Remove global style for select option panel width after v16.1

[amysorto]

Once upgraded past v16.1, there is a panelWidth input property for mat-select that can be set to null. By default options are set to the select trigger width, but can be set to the longest option width instead. For context: angular/components#26000

[Alijavedofficial]

First, identify the global styles that are affecting the panel width.Then you can use the panelWidth property on the mat-select component to control the width of the panel. Setting panelWidth to null will make the panel width adjust to the longest option.