Combine throttle implementations

[philippjfr]

We had two throttle JS implementations, both were flawed.

1. The one used for throttling streaming HTML output was actually debouncing, causing updates to be stalled until the streaming stopped.
2. The implementation used elsewhere was mostly okay but did not implement trailing execution which meant that if the final update was never executed if the previous update occurred within the timeout period.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.37%. Comparing base (cf9dc6b) to head (7793f0b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7480   +/-   ##
=======================================
  Coverage   82.36%   82.37%           
=======================================
  Files         338      338           
  Lines       50964    50964           
=======================================
+ Hits        41977    41981    +4     
+ Misses       8987     8983    -4     

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