fix: Override disableSnapInstallation feature flag when using automatic updates

[FrederikBolding]

Allow updates of Snaps even when the disableSnapInstallation feature flag is enabled as long as the update is an automatic one.

---

Note

Permits automatic Snap updates to bypass the disableSnapInstallation check while preserving manual update restrictions for preinstalled Snaps.

• Snaps Controller (SnapController.ts):
  • Modify #updateSnap(...) to only call #assertCanInstallSnaps() when automaticUpdate is false, allowing automatic updates even if disableSnapInstallation is enabled.
  • Retain restriction preventing manual updates of preinstalled Snaps (preinstalled && !automaticUpdate).

^{Written by Cursor Bugbot for commit 4c35eb4. This will update automatically on new commits. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.28%. Comparing base (e081eb2) to head (4c35eb4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3735   +/-   ##
=======================================
  Coverage   98.28%   98.28%           
=======================================
  Files         418      418           
  Lines       12162    12163    +1     
  Branches     1880     1881    +1     
=======================================
+ Hits        11953    11954    +1     
  Misses        209      209           

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