Use plantuml workflow instead generic one

[CAMOBAP]

Metanorma PR checklist

• Breaking changes (list related PRs)
• Documentation update required (create task for this)
• External dependency introduced (documentation update need)
• Gem with native library introduced

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c71e6cb) 96.61% compared to head (bd1b666) 96.61%.
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #833      +/-   ##
==========================================
- Coverage   96.61%   96.61%   -0.01%     
==========================================
  Files          64       64              
  Lines        5291     5287       -4     
==========================================
- Hits         5112     5108       -4     
  Misses        179      179              

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