fix: prevent duplicate teamspace entries in _list_available_teamspaces

[deependujha]

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What does this PR do?

Fixes # (issue).

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[ethanwharris]

Surprising that we need to interact with such low-level / private SDK things here. Will cause issues if the SDK changes internally. Might be worth seeing if a lot of this can just be pulled out

[deependujha]

@ethanwharris ig it might be due to this.

same teamspace is shown for both User Org & Personal teamspace. It makes sense for CLI to directly handle this and return the list.

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Codecov Report

❌ Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 83%. Comparing base (d3e3247) to head (bcbd653).
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Additional details and impacted files

@@         Coverage Diff         @@
##           main   #164   +/-   ##
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- Coverage    84%    83%   -1%     
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  Files        12     12           
  Lines       511    516    +5     
===================================
  Hits        430    430           
- Misses       81     86    +5     

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