Refactor cake script

[martincostello]

Refactor based on analyser warnings from #2531.

[Copilot]

Pull Request Overview

Refactors the Cake build script to address analyzer warnings and minor cleanups.

• Replace unused lambda parameters in Task.Does handlers with discards.
• Switch from RunTarget to awaited RunTargetAsync.
• Add null-forgiving operators when reading JSON config nodes and remove redundant parentheses on object creation.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.15%. Comparing base (adca621) to head (a26a587).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2769   +/-   ##
=======================================
  Coverage   96.15%   96.15%           
=======================================
  Files         309      309           
  Lines        7123     7123           
  Branches     1005     1005           
=======================================
  Hits         6849     6849           
  Misses        221      221           
  Partials       53       53           

Flag	Coverage Δ
linux	96.15% <ø> (ø)
macos	96.15% <ø> (ø)
windows	96.14% <ø> (ø)

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