Fix issue scaling on image filter appication

[klakhov]

Motivation and context

Currently we have such a problem:

The issue occurs when applying an image filter. The bug follows these steps:

1. Enabling an image filter triggers canvas.configure().
2. Inside canvas.configure(), canvas.fit() is called (likely to maintain zoom and position even when switching to an image with a different resolution).
3. canvas.fit() dispatches a canvas.fit event, which the issues component listens to. As a result, the issues component receives the default zoom, causing issue elements to appear larger than expected.

To fix this, I extracted the scale reset into a separate method. There's no need to dispatch the fit event inside canvas.configure(), as inside of it we need to reset the scale to base parameters before adjusting it with relativeScaling

How has this been tested?

Checklist

• I submit my changes into the develop branch
• I have created a changelog fragment
• [ ] I have updated the documentation accordingly
• [ ] I have added tests to cover my changes
• [ ] I have linked related issues (see GitHub docs)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.83%. Comparing base (558a861) to head (c98b66a).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #9126   +/-   ##
========================================
  Coverage    73.83%   73.83%           
========================================
  Files          431      431           
  Lines        44807    44811    +4     
  Branches      3892     3893    +1     
========================================
+ Hits         33084    33087    +3     
- Misses       11723    11724    +1     

Components	Coverage Δ
cvat-ui	77.53% <100.00%> (-0.01%)	⬇️
cvat-server	70.79% <ø> (ø)