chore!: Remove deprecated UI builders

[FrederikBolding]

We still see Snaps submitted that use the legacy components, they have been deprecated for a long time, so we should remove them from the SDK. This does not break old Snaps that still use these, it just removes the builder functions from the SDK.

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Note

Medium Risk
Breaking API removal for any downstream code still importing the legacy builder functions; internal behavior is mostly unchanged but surface-area churn is broad across packages.

Overview
Removes deprecated legacy Snap UI builder helpers from @metamask/snaps-sdk (e.g. panel, text, form, input, button, and the internal createBuilder/component helpers), leaving only the struct/type definitions and NodeType exports for object-based nodes.

Updates consumers and tests across snaps-controllers, snaps-rpc-methods, snaps-simulation, snaps-utils, and snaps-jest to stop using the removed builders and instead pass explicit { type: NodeType.* } node objects (or JSX where supported). Also removes getImageComponent from snaps-sdk/images (tests and implementation), keeping only getImageData.

^{Written by Cursor Bugbot for commit 85d66d2. This will update automatically on new commits. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.58%. Comparing base (4bff8c7) to head (85d66d2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3859      +/-   ##
==========================================
- Coverage   98.58%   98.58%   -0.01%     
==========================================
  Files         428      426       -2     
  Lines       12389    12332      -57     
  Branches     1927     1921       -6     
==========================================
- Hits        12214    12157      -57     
  Misses        175      175              

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[Mrtenz]

We should stop supporting markdown when we completely drop the UI builders

[FrederikBolding]

yep