lib: use SafeMap primordial for ActiveAsyncContextFrame

[gurgunday]

Not sure if this was intentional, but (In)ActiveAsyncContextFrame seems to extend Map without using primordials

Tracked down the change to ef6b9ff

Cc @bengl

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.23%. Comparing base (af75d04) to head (d2b3308).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #57670   +/-   ##
=======================================
  Coverage   90.23%   90.23%           
=======================================
  Files         630      630           
  Lines      185055   185056    +1     
  Branches    36221    36220    -1     
=======================================
+ Hits       166984   166989    +5     
  Misses      11043    11043           
+ Partials     7028     7024    -4     

Files with missing lines	Coverage Δ
lib/internal/async_context_frame.js	76.62% <100.00%> (+0.30%)	⬆️

... and 24 files with indirect coverage changes

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