feat: Add option to disable seeking while scrubbing on mobile

[alex-barstow]

Description

On desktop, a user can hover over the progress bar while content plays, which makes it possible to seek to a relatively precise location without disrupting playback. On mobile there is no hovering, so in order to seek during inline playback the user can only tap a location on the progress bar (very hard to do precisely on a small screen) or scrub to try to hone in on a specific location (can be very clunky because seeks are constantly being executed). This PR adds a feature to treat scrubbing on mobile more like hovering on desktop-- while scrubbing, seeks are disabled and playback continues, only when the user finishes scrubbing is a single seek executed to the desired location.

One key use-case for this feature is thumbnail seeking integrations on mobile, where the user can scrub through different thumbnail images until they find their desired seek location.

Specific Changes proposed

This behavior is similar to the existing enableSmoothSeeking behavior in that the PlayProgressBar slider visibly updates with the scrubbing movements, but differs in a few ways:

• Playback continues while scrubbing, no seeks are executed until touchend.
• The seek bar's TimeTooltip component displays the target seek time while scrubbing, rather than the CurrentTimeDisplay (which continues to show the current time of the playing content).

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)
  • Has no DOM changes which impact accessiblilty or trigger warnings (e.g. Chrome issues tab)
  • Has no changes to JSDoc which cause npm run docs:api to error
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.53%. Comparing base (d2b9d5c) to head (19faaaf).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
...s/control-bar/progress-control/progress-control.js	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8903      +/-   ##
==========================================
- Coverage   83.85%   83.53%   -0.32%     
==========================================
  Files         120      120              
  Lines        8097     8110      +13     
  Branches     1944     1949       +5     
==========================================
- Hits         6790     6775      -15     
- Misses       1307     1335      +28     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.