release: 156.0.0

[FrederikBolding]

Release candidate for version 156.0.0. Includes a single fix for a problem encountered during release testing.

---

Note

Low Risk
Low risk: this PR is limited to version bumps and changelog updates (no functional code changes in this diff). The main impact is release/versioning metadata and whatever behavior shifts come from pulling updated controller dependencies.

Overview
Bumps the monorepo version to 156.0.0 and @metamask/snaps-controllers to 20.0.4.

Updates @metamask/snaps-controllers/CHANGELOG.md for the 20.0.4 release, including noting dependency bumps (@metamask/permission-controller, @metamask/json-rpc-engine, @metamask/messenger, @metamask/base-controller) and a fix to omit installing Snaps from getAllSnaps / getRunnableSnaps, plus updating compare links.

^{Reviewed by Cursor Bugbot for commit 6218d82. Bugbot is set up for automated code reviews on this repo. Configure here.}

[Mrtenz]

Wondering where this came from 🤔

[FrederikBolding]

We updated auto-changelog recently, so potentially that?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.56%. Comparing base (6b6505d) to head (6218d82).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3991   +/-   ##
=======================================
  Coverage   98.56%   98.56%           
=======================================
  Files         429      429           
  Lines       12366    12366           
  Branches     1944     1944           
=======================================
  Hits        12188    12188           
  Misses        178      178           

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