[web] introduce redux persist migration for globalThemeInfo

Summary:
We want to make sure that globalThemeInfo is persisted in redux. This diff creates a redux persist migration for globalThemeInfo

Part of https://linear.app/comm/issue/ENG-4958/update-theme-based-on-the-active-theme-redux-state

Depends on D9551

Test Plan:
Please see the following below:

globalThemeInfo is in my redux state

globalThemeInfo being persisted

Reviewers: atul, rohan, inka

Reviewed By: atul

Subscribers: ashoat, tomek, wyilio

Differential Revision: https://phab.comm.dev/D9552