Improve timezone option labels for better keyboard filtering

[Atharv-Bandekar]

Describe the bug

Currently, timezone options are prefixed with "(UTC …)", which prevents effective
keyboard-based filtering because all options start with the same characters.

This affects users who rely on keyboard navigation or type-to-select behavior
in select components.

Example (current):
(UTC +05:30) India
(UTC +01:00) Germany

Suggested improvement:
India (UTC +05:30)
Germany (UTC +01:00)

This change improves accessibility and keyboard navigation without affecting
the underlying timezone values.

I am happy to submit a PR if this approach is acceptable.

Reproduction

Steps to reproduce: 1. Use the TimezoneSelect component from this library. 2. Open the timezone dropdown. 3. Focus the select input and start typing a location name (e.g., "I" for India or "G" for Germany). 4. Observe that type-to-select does not work as expected because all options begin with "(UTC …)". Expected behavior: Typing the first letter of a location should jump to the corresponding timezone. Actual behavior: Typing any letter does not meaningfully filter or jump because all labels share the same "(UTC …)" prefix.

System Info

OS: Any
Browser: Any
Node.js: Any
Affected version: All current versions of react-timezone-select

This issue is independent of environment and reproducible across systems,
as it relates to option label formatting.

Used Package Manager

npm

Validations

• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A, please open a GitHub Discussion instead.
• The provided reproduction is a minimal reproducible of the bug.