Log periodically when deleteAll is called with an alarm still set

[a-robinson]

This is a companion to the compatibility date being added in #6044, to gather more data on the prevalence of this happening.

[a-robinson]

The force push was just to rebase on latest main, since it appeared to be hitting some package version/checksum issues in CI.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 70.34%. Comparing base (9a08d8e) to head (d3d6c56).

Files with missing lines	Patch %	Lines
src/workerd/io/actor-cache.c++	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6056      +/-   ##
==========================================
- Coverage   70.35%   70.34%   -0.02%     
==========================================
  Files         408      408              
  Lines      108650   108658       +8     
  Branches    17992    17997       +5     
==========================================
- Hits        76445    76437       -8     
- Misses      21407    21422      +15     
- Partials    10798    10799       +1     

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