Rename the draft method to save_draft for clarity

[saitgulmez]

Fixes #8690 (<=== Add issue number here)

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[codeclimate]

Code Climate has analyzed commit 247b360 and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Merging #8693 into main will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #8693   +/-   ##
=======================================
  Coverage   81.77%   81.77%           
=======================================
  Files         101      101           
  Lines        5905     5905           
=======================================
  Hits         4829     4829           
  Misses       1076     1076           

Impacted Files	Coverage Δ
app/models/node.rb	91.45% <100.00%> (ø)

[cesswairimu]

Thanks for working on this @saitgulmez 🎉

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