feat!: Allow updating preinstalled Snaps via the registry

[FrederikBolding]

Allow updating preinstalled Snaps by updating their entry in the registry. This is accomplished by searching the registry for updates whenever updateRegistry is called and triggering #updateSnap. As part of this PR the previously named updateBlockedSnaps has been renamed to updateRegistry and a flag to allow automatic updates has been added to #updateSnap.

When an update is automatic, the permissions requested by the Snap are applied automatically similarly to how a preinstalled Snap is initialized. Preinstalled Snaps can still be installed and updated via the constructor. In case of any errors applying the update, the Snap is rolled back to its previous state.

This behavior is put behind a feature flag that we can decide to enable at a later date.

Closes #3593

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.28%. Comparing base (770eafa) to head (b8d5836).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3616   +/-   ##
=======================================
  Coverage   98.28%   98.28%           
=======================================
  Files         417      417           
  Lines       11768    11793   +25     
  Branches     1830     1841   +11     
=======================================
+ Hits        11566    11591   +25     
  Misses        202      202           

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