[sitecore-jss-nextjs] Fix page not found error on pages.

[addy-pathania]

• [x] This PR follows the Contribution Guide
• [x] Changelog updated
• [ ] Upgrade guide entry added

Description / Motivation

When switching between page and subpage on Pages we get Page not found error because there are duplicate cookies set by nextjs setPreviewData function on each page route. There should be single active preview cookie at the root of your session.

Testing Details

• [ ] Unit Test Added
• [x] Manual Test/Other (Please elaborate)

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

[addy-pathania]

Looks good. Is there some unit test that will need updating (or should be added)?

Nothing really to update in tests since it was a optional options param in the setPreviewData function.