chore: improve iterable network handler

[sanpj2292]

What are the changes introduced in this PR?

Provide more structure to the an improved network handler for Iterable destination.

What is the related Linear task?

Resolves INT-2901

Please explain the objectives of your changes below

Put down any required details on the broader aspect of your changes. If there are any dependent changes, mandatorily mention them here

Any changes to existing capabilities/behaviour, mention the reason & what are the changes ?

N/A

Any new dependencies introduced with this change?

N/A

Any new generic utility introduced or modified. Please explain the changes.

N/A

Any technical or performance related pointers to consider with the change?

N/A

@coderabbitai review

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Developer checklist

• My code follows the style guidelines of this project

• No breaking changes are being introduced.

• All related docs linked with the PR?

• All changes manually tested?

• Any documentation changes needed with this change?

• Is the PR limited to 10 file changes?

• Is the PR limited to one linear task?

• Are relevant unit and component test-cases added in new readability format?

Reviewer checklist

• Is the type of change in the PR title appropriate as per the changes?

• Verified that there are no credentials or confidential data exposed with the changes.

[devops-github-rudderstack]

Test report for this run is available at: https://test-integrations-dev.s3.amazonaws.com/integrations-test-reports/rudder-transformer/3918/test-report.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.49%. Comparing base (97d531f) to head (96ae92c).
Report is 1 commits behind head on fix.iterable-networkhandler.

Additional details and impacted files

@@                       Coverage Diff                       @@
##           fix.iterable-networkhandler    #3918      +/-   ##
===============================================================
- Coverage                        90.49%   90.49%   -0.01%     
===============================================================
  Files                              619      619              
  Lines                            32440    32408      -32     
  Branches                          7701     7691      -10     
===============================================================
- Hits                             29358    29328      -30     
+ Misses                            2858     2824      -34     
- Partials                           224      256      +32     

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[sonarqubecloud]

Quality Gate failed

Failed conditions
3 New Code Smells (required ≤ 1)

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