Allow Admins to set gateway timezone for budget rollovers

[timryall]

Problem

Allow admins to set the timezone for gateway budget rollovers. Currently this is hardcoded to UTC.

This can result in frustrated or confused users with a daily budget. For example:
User A is in the AEST timezone, and they use up all their daily budget at 5pm AEST on Monday. They log in Tuesday morning and have to wait till 10am AEST (Midnight UTC) for their daily budget to reset.

This is purely a quality-of-life change and not critical.

Proposed solution

Admin portal feature to set the timezone that the gateway budgets are linked to.

Optional Extras:

• Allow admins to set timezone per Team (In teams page)
• Allow admins to set timezone per user (In members page) OR allow users to set their own timezone (In dashboard page)

Component

Admin Portal