fix(skip-forward): error when clicking after player reset

[amtins]

Description

This PR fixes the error thrown when clicking the skip-forward button after the player has been reset.

skip-forward.webm

Specific Changes proposed

• short-circuit the handleClick function if the duration is NaN
• add a test case

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Change has been verified in an actual browser (Chrome, Firefox, IE)
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

Merging #8258 (b9eb39b) into main (1491d71) will increase coverage by 82.37%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##           main    #8258       +/-   ##
=========================================
+ Coverage      0   82.37%   +82.37%     
=========================================
  Files         0      112      +112     
  Lines         0     7476     +7476     
  Branches      0     1801     +1801     
=========================================
+ Hits          0     6158     +6158     
- Misses        0     1318     +1318     

Impacted Files	Coverage Δ
src/js/control-bar/skip-buttons/skip-forward.js	100.00% <100.00%> (ø)

... and 111 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more