test: Refactor RemoteApplication to consolidate common code

[tippmar-nr]

Refactors the Start() method in RemoteApplication() to eliminate duplicate (and near-duplicate) code. Adds a number of new virtual methods that inheritors can set for their specific needs.

Resolves #2748

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.16%. Comparing base (0cfdedb) to head (4c85bd6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3161      +/-   ##
==========================================
+ Coverage   82.15%   82.16%   +0.01%     
==========================================
  Files         485      485              
  Lines       31104    31104              
  Branches     3546     3546              
==========================================
+ Hits        25554    25558       +4     
+ Misses       4725     4719       -6     
- Partials      825      827       +2     

Flag	Coverage Δ
Agent	83.43% <ø> (+0.01%)	⬆️
Profiler	70.23% <ø> (ø)

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see 3 files with indirect coverage changes

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