fix cleanup of waitFor timers when an error occurs during onTimeout printout

[ggilles]

This is an attempt at fixing the timer cleanup bug described in #1917.

Summary

There are 2 fixes in there:

• added a try/catch around processing onTimeout so that if an error happens while doing so (while dumping the screen for example), timers are still cleaned up
• added cleanup of running timers when the top level timer expires.

Test plan

I included tests for both cases explained above. Very new to this codebase, so I'm not sure I'm doing it correctly. Forgive me is isn't suitable 🙏 .

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.42%. Comparing base (e5e8e37) to head (1ba06aa).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1918      +/-   ##
==========================================
+ Coverage   98.40%   98.42%   +0.02%     
==========================================
  Files          79       79              
  Lines        1501     1521      +20     
  Branches      414      401      -13     
==========================================
+ Hits         1477     1497      +20     
  Misses         24       24              

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