[Time Zone] Contents on 'time zone' dropdown list in FF browsers are inconsistent with the same dropdown list in other browsers

[BLin2525]

Check existing issues

• [X] I have checked for existing issues to avoid duplicates

Actual Behavior

There are UTC, WET listed on the time zone dropdown list in firefox, while there is no such zone in other browsers like Edge and Chrome

Expected Behavior

The content on the time zone dropdown list should be consistent across all browsers. such as below screen in Chrome

Reproduction Sample

https://developers.arcgis.com/calcite-design-system/components/input-time-zone/

Reproduction Steps

1. launch Firefox brower and navigate into https://developers.arcgis.com/calcite-design-system/components/input-time-zone/
2. click the properties icon on the top-right of sample windows.
3. select "name" on the mode field.
4. move the scroll bar for the time zone input to bottom,
5. observe, there are UTC, WET zones at the bottom.

Reproduction Version

2.2.0

Relevant Info

FireFox in Windows 10, IOS,

Regression?

no, this is new found issue

Priority impact

p3 - want for upcoming milestone

Impact

This makes content of timezone in the downstream apps inconsistent between Firefox and other browsers.

Calcite package

• [X] @esri/calcite-components
• [ ] @esri/calcite-components-angular
• [ ] @esri/calcite-components-react
• [ ] @esri/calcite-design-tokens
• [ ] @esri/eslint-plugin-calcite-components

Esri team

N/A

[jcfranco]

Blocked by https://github.com/jcfranco/timezone-groups/issues/2 and https://github.com/jcfranco/timezone-groups/issues/1.

[jcfranco]

The changes required by timezone-groups might be breaking, so it might be good to move this one to target our breaking change release. cc @geospatialem