Explicitly disallow iteration on Promises

[wild-endeavor]

Tracking issue

flyteorg/flyte#5164

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How was this patch tested?

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• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.89%. Comparing base (bf38b8e) to head (3cf8d83).
Report is 4 commits behind head on master.

❗ Current head 3cf8d83 differs from pull request most recent head 646d31a. Consider uploading reports for the commit 646d31a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2337      +/-   ##
==========================================
- Coverage   83.04%   75.89%   -7.15%     
==========================================
  Files         324      180     -144     
  Lines       24861    18136    -6725     
  Branches     3547     3547              
==========================================
- Hits        20645    13765    -6880     
- Misses       3591     3777     +186     
+ Partials      625      594      -31     

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