[Bug Fix] [CAP] Sleep removal introduced an Actor resolution bug.

[rajan-chari]

Why are these changes needed?

Fixes Actor resolution issue introduced by sleep() Technical debt PR.

Related issue number

#2295

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.16%. Comparing base (c030225) to head (f970d1d).
Report is 24 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2296      +/-   ##
==========================================
+ Coverage   37.94%   38.16%   +0.21%     
==========================================
  Files          77       78       +1     
  Lines        7784     7861      +77     
  Branches     1667     1681      +14     
==========================================
+ Hits         2954     3000      +46     
- Misses       4580     4611      +31     
  Partials      250      250              

Flag	Coverage Δ
unittests	38.15% <ø> (+0.21%)	⬆️

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