refactor(Intercom) : remove unwanted code

[ItsSudip]

Description of the change

We are removing the flattenEventObject function as we are using an existing util function.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Related issues

Fix #1

Checklists

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests
• All tests related to the changed code pass in development

Code review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• "Ready for review" label attached to the PR and reviewers mentioned in a comment
• Changes have been reviewed by at least one other engineer
• Issue from task tracker has a link to this pull request

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This change is 

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
Core - CDN	37.16 KB (0%)	744 ms (0%)	596 ms (-1.72% 🔽)	1.4 s
All Integrations - CDN	777.36 KB (-0.02% 🔽)	15.6 s (-0.02% 🔽)	3.3 s (-7.23% 🔽)	18.9 s
Core - NPM	37.37 KB (0%)	748 ms (0%)	433 ms (+10.49% 🔺)	1.2 s