chore!: Make getTruncatedSnap and getTruncatedSnapExpect private

[Mrtenz]

This changes the getTruncatedSnap and getTruncatedSnapExpect methods on SnapController to be private.

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Note

Medium Risk
Medium risk because it is a breaking API surface change: external consumers can no longer call SnapController.getTruncatedSnap* and must switch to other helpers, though runtime behavior is otherwise unchanged.

Overview
Makes SnapController’s getTruncatedSnap/getTruncatedSnapExpect methods private (converted to #getTruncatedSnap/#getTruncatedSnapExpect) and updates all internal event payloads and flows (snapInstalled, snapUpdated, snapEnabled/disabled, snapTerminated, rollback, etc.) to use the new private methods.

Updates tests to stop calling the controller methods directly and instead assert against getTruncatedSnap(...), and documents the breaking removal in the CHANGELOG.

^{Written by Cursor Bugbot for commit f728514. This will update automatically on new commits. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.56%. Comparing base (c038fb4) to head (f728514).
⚠️ Report is 1 commits behind head on controller-refactors.

Additional details and impacted files

@@                   Coverage Diff                    @@
##           controller-refactors    #3923      +/-   ##
========================================================
- Coverage                 98.56%   98.56%   -0.01%     
========================================================
  Files                       425      425              
  Lines                     12313    12311       -2     
  Branches                   1934     1934              
========================================================
- Hits                      12136    12134       -2     
  Misses                      177      177              

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