PROD-1762: Adds `mobify-capture=false` as a parameter for preview.

Allows users to disable capturing while loading preview.
  
Status: **Opened for Review**
 
Reviewers: @jansepar 
JIRA: https://mobify.atlassian.net/browse/PROD-1762
Linked PRs: **PORTAL PR TO BE DONE**
  
## Changes
- Adds `mobify-capture=false` flag.
  
## How to test-drive this PR
- Run the tests