chore: removed unused package percent_indicator

[monsieurtanuki]

What

• Removed a package dependency to percent_indicator, that would somehow be a duplicate of flutter_animation_progress_bar
• Removed an unused related class.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 7.72%. Comparing base (4d9c7fc) to head (47459e9).
Report is 150 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5308      +/-   ##
==========================================
- Coverage     9.54%   7.72%   -1.83%     
==========================================
  Files          325     366      +41     
  Lines        16411   18504    +2093     
==========================================
- Hits          1567    1430     -137     
- Misses       14844   17074    +2230     

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[g123k]

Perfect, the kind of useless thing

[monsieurtanuki]

Thank you @g123k for your review!
I guess it was a "just in case" class that got abandoned.
Speaking of which, please have a look at #5040 too ;)