release: 151.0.0

[FrederikBolding]

Hotfix release for previous release 150.

---

Note

Low Risk
This is a release-only PR that bumps package versions and updates changelog metadata; no runtime code changes are included.

Overview
Bumps the monorepo version to 151.0.0 and publishes a hotfix @metamask/snaps-rpc-methods 15.1.1 release.

Updates snaps-rpc-methods changelog to include the 15.1.1 entry (noting the KeyringOrigin caveat optionality fix) and adjusts compare links accordingly.

^{Reviewed by Cursor Bugbot for commit 2a15feb. Bugbot is set up for automated code reviews on this repo. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.56%. Comparing base (a086680) to head (2a15feb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3956   +/-   ##
=======================================
  Coverage   98.56%   98.56%           
=======================================
  Files         428      428           
  Lines       12347    12347           
  Branches     1940     1940           
=======================================
  Hits        12170    12170           
  Misses        177      177           

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