FMWK-530 Fix handlers .Wait() context

[filkeith]

• removed context from handlers .Wait() methods
• pass global backup context to handlers

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.57%. Comparing base (055bdb3) to head (5099b78).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #111      +/-   ##
==========================================
+ Coverage   80.44%   80.57%   +0.13%     
==========================================
  Files          62       62              
  Lines        3216     3218       +2     
==========================================
+ Hits         2587     2593       +6     
+ Misses        436      432       -4     
  Partials      193      193              

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[reugn]

As to our discussion, we'll need to refactor the logic and evaluate the option of returning the context parameter.