Test for button on frame player that copies the current frame's filename

[archibald1418]

This checks that the frame filename displayed in the annotation view UI is copied to clipboard correctly
Smoke test for #8989

How has this been tested?

Use the existing Main task to trigger UI events that change clipboard contents.

Prepartion

before the test suite

• Create main task
• Open main task job

before each test case

• Add a spy on the window's clipboard (has to be new every case)
  Note: Unlike mocks, spies call the real function to gain information on how this function was called

Cases

Case 1: Check that frame filename can be copied to clipboard

• Scrape active filename
• Press on button, confirm that both filenames are equal

Case 2: Check clipboard after switching frames

• Switch to next frame
• Repeat actions from Case 1

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.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.93%. Comparing base (df5678a) to head (0f1bc84).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9081      +/-   ##
===========================================
+ Coverage    73.91%   73.93%   +0.01%     
===========================================
  Files          428      428              
  Lines        44530    44530              
  Branches      3881     3881              
===========================================
+ Hits         32916    32922       +6     
+ Misses       11614    11608       -6     

Components	Coverage Δ
cvat-ui	77.47% <ø> (+0.02%)	⬆️
cvat-server	71.00% <ø> (ø)

[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