Add get_additional_upstream_nodes to FlytekitPlugin

[pingsutw]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.39%. Comparing base (a50eb4b) to head (9992f13).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2708      +/-   ##
==========================================
+ Coverage   75.09%   76.39%   +1.30%     
==========================================
  Files         187      303     +116     
  Lines       19236    24401    +5165     
  Branches     4018     4019       +1     
==========================================
+ Hits        14445    18642    +4197     
- Misses       4074     5071     +997     
+ Partials      717      688      -29     

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