Remove unused flush method.

[bsneed]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.23%. Comparing base (499a67c) to head (0ad23bd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #391      +/-   ##
==========================================
+ Coverage   70.08%   70.23%   +0.14%     
==========================================
  Files          48       48              
  Lines        4797     4794       -3     
==========================================
+ Hits         3362     3367       +5     
+ Misses       1435     1427       -8     

Files with missing lines	Coverage Δ
Sources/Segment/Plugins/SegmentDestination.swift	93.48% <ø> (+2.57%)	⬆️

... and 1 file with indirect coverage changes

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