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
Regression 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

Case 3: Check clipboard after deleting frame and after Undo

• Repeat actions from Case 1, store the current filename
• Delete a frame and save the job
• Repeat actions from Case 1 (validates that the name has changed)
• Click 'Undo' button to cancel deletion. Save the job
• Validate that current filename is the same as old filename stored previously

Case 4: Check clipboard after deleting and restoring frame

Same as Case 3 but with frame visibility enabled in user settings. The assertion is that the filename and the clipboard shouldn't change after deletion and after restoration

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 73.92%. Comparing base (fb3bde4) to head (8a2d873).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #9081   +/-   ##
========================================
  Coverage    73.91%   73.92%           
========================================
  Files          428      428           
  Lines        44530    44530           
  Branches      3881     3881           
========================================
+ Hits         32915    32917    +2     
+ Misses       11615    11613    -2     

Components	Coverage Δ
cvat-ui	77.45% <ø> (+<0.01%)	⬆️
cvat-server	71.00% <ø> (ø)

[klakhov]

It's better to name this copyToClipboard since it not only retrieves the clipboard contents but also triggers the action by pressing the button.

[klakhov]

I'm not entirely sure if we need tests that mix copying and deleting, as these are separate functionalities. Deleting a frame shouldn't affect copying. If treated separately, we are essentially repeating the same operations as in the previous two tests: copy → change frame → copy again. Even if there were a potential intersection, it would be considered a regression and should be covered by a dedicated regression test. Since we haven't encountered such a regression, I suggest we remove these test cases for now.