Fixes failing browser tests by mocking intercom script

[varadarajan-tw]

Browser tests are failing have been failing for a while.
I am not sure whats the root cause but if i mock intercom's load script, it seems to fix everything.

Before

Testing

Testing completed via CI.

• Added unit tests for new functionality
• Tested end-to-end using the local server
• [If destination is already live] Tested for backward compatibility of destination. Note: New required fields are a breaking change.
• [Segmenters] Tested in the staging environment
• [Segmenters] [If applicable for this change] Tested for regression with Hadron.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.18%. Comparing base (09e84ae) to head (254e66e).
Report is 2 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (09e84ae) and HEAD (254e66e). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (09e84ae)	HEAD (254e66e)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2512       +/-   ##
===========================================
- Coverage   78.78%   33.18%   -45.60%     
===========================================
  Files        1052       14     -1038     
  Lines       20503      693    -19810     
  Branches     4228      109     -4119     
===========================================
- Hits        16153      230    -15923     
+ Misses       3256      463     -2793     
+ Partials     1094        0     -1094     

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