[Iterable Lists] Adding logic to not create an audience if an existing audience already exists with the same name.

[seg-leonelsanches]

After testing Iterable Lists destination with the customer, we found out that the audience lifecycle tries to create an audience more than once, which it generates errors on Iterable, preventing the audience to sync correctly.

Here I add logic to first verify whether the corresponding list already exists. If it exists, the logic returns its id.

Testing

• 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

Attention: Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.00%. Comparing base (2574714) to head (240a9fe).

Files with missing lines	Patch %	Lines
...n-actions/src/destinations/iterable-lists/index.ts	93.75%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2511   +/-   ##
=======================================
  Coverage   77.99%   78.00%           
=======================================
  Files         991      991           
  Lines       17383    17390    +7     
  Branches     3281     3283    +2     
=======================================
+ Hits        13558    13565    +7     
  Misses       2737     2737           
  Partials     1088     1088           

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