Clean up TimezoneDropdown component
What does this MR do and why?
This is a follow up after the migration done in !96567 (merged)
- clean up a folder structure so it's clear that TimezoneDropdown is an independent shared component
- extract helper methods to a separate file
- adjust tests
Related to #369974 (closed)
Screenshots or screen recordings
No visible changes
How to set up and validate locally
- Open the Edit Profile page http://localhost:3000/-/profile and double check that the dropdown still works as expected
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Diana Zubova