Add Zoom To Results control button with feature flag

[ccallendar]

Description:

Add new feature flag environment variable for the Map page that when turned on, will make a new control button show up above the zoom in/out buttons that when clicked will zoom to show all search results.

Definition of Ready:

• [x] Design / Solution is accepted by Product Owner

Definition of Done:

• [ ] Ready to Demo in Sprint Review
• [ ] Does what I have made have appropriate test coverage?
• [ ] Documentation and/or scientific documentation exists and can be found
• [ ] Peer Reviewed by 2 people on the team
• [ ] Manual testing of all PRs in Dev and Prod
• [x] Merged

[dawnbcgov]

Merged in: https://github.com/bcgov/nr-epd-organics-info/pull/213