[Feature] Setting multiple timezones for unioned multiple connectors

### Is there an existing feature request for this?

- [X] I have searched the existing issues

### Describe the Feature

We are using multiple shopify connectors, each of them runs in different timezone - atm I am able to assign only one timezone per package - it would be great to be able to assign a particular timezone to particular connector ( ie Europe/London -> shopify_uk , Europe/Paris - > shopify_fr. Otherwise unioning multiple connections have sense only if they are in the same timezone.

### Describe alternatives you've considered

_No response_

### Are you interested in contributing this feature?

- [ ] Yes.
- [ ] Yes, but I will need assistance and will schedule time during your [office hours](https://calendly.com/fivetran-solutions-team/fivetran-solutions-team-office-hours) for guidance.
- [X] No.

### Anything else?

_No response_

The issue names no files, tests, or entry points. Start by locating the package-level timezone configuration and the logic that unions connectors, then determine how a per-connector mapping could be represented and verified for the Europe/London and Europe/Paris examples.

Written by the indexing model from the issue text.