Dev - Allow background tasks the opportunity to be awaited in Base.main()

[vEpiphyte]

Allow background tasks the opportunity to be awaited at the end of Base.main().

With telepath proxy Link teardown deferred to background tasks (#4166), this allows the links to be torn down by our application instead of being terminated at interpreter shutdown. These un-fini'd Link's are normally not seen in container based environments due to the usage of -O to remove __debug__ statements; which hides the log output showing the un-fini'd links in of the base._fini_atexit handler.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.72%. Comparing base (e6e3277) to head (3d82930).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4645   +/-   ##
=======================================
  Coverage   97.71%   97.72%           
=======================================
  Files         295      295           
  Lines       62057    62058    +1     
=======================================
+ Hits        60642    60645    +3     
+ Misses       1415     1413    -2     

Flag	Coverage Δ
linux	97.65% <100.00%> (+<0.01%)	⬆️
linux_replay	93.38% <100.00%> (+0.01%)	⬆️

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