chore: replace occurrences of 'enum' by 'flag'

[trocher]

What I did

Rename occurrences of enum by flag missed by #3697

How I did it

control-F "enum", then replace relevant occurrences

How to verify it

It should be straightforward from the changes

Commit message

chore: replace occurrences of 'enum' by 'flag'

Description for the changelog

replace occurrences of 'enum' by 'flag'

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[charles-cooper]

lgtm, thanks!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d8d98c2) 84.99% compared to head (80799c3) 84.99%.
Report is 2 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3794   +/-   ##
=======================================
  Coverage   84.99%   84.99%           
=======================================
  Files          92       92           
  Lines       13733    13733           
  Branches     3078     3078           
=======================================
  Hits        11673    11673           
  Misses       1572     1572           
  Partials      488      488           

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