Ensure IconButton tooltip timer is cleared on multiple mouseenter events

[philippjfr]

In certain situation it seems like the description tooltip on an IconButton wasn't cleared correctly. I wasn't able to reproduce myself but added some handling around avoiding race conditions with multiple mouseenter events firing and using the more reliable pointerleave event.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.08%. Comparing base (c77396f) to head (d7404ff).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7798      +/-   ##
==========================================
+ Coverage   86.08%   87.08%   +0.99%     
==========================================
  Files         346      346              
  Lines       52970    52970              
==========================================
+ Hits        45600    46127     +527     
+ Misses       7370     6843     -527     

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