refactor: migrate NetworkEnablementController to @metamask/messenger

[cryptodev-2s]

Explanation

This PR migrates NetworkEnablementController to the new @metamask/messenger message bus, as opposed to the one exported from @metamask/base-controller.

References

• Related to Implement messenger delegation #5626

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

---

Note

Migrates NetworkEnablementController to the new @metamask/messenger API, updates metadata and tests, and adds related package/config references.

• Controller:
  • Migrate from RestrictedMessenger (@metamask/base-controller) to Messenger (@metamask/messenger); update type NetworkEnablementControllerMessenger and wiring.
  • Switch imports to @metamask/base-controller/next and replace messagingSystem.call with messenger.call.
  • Keep existing logic; update subscribe handlers to new messenger usage.
  • Rename metadata key from anonymous to includeInDebugSnapshot.
• Tests (src/NetworkEnablementController.test.ts):
  • Rework to use root/child Messenger instances with delegation; publish via rootMessenger.
  • Update spies to target messenger.call; remove old helper and adjust setups accordingly.
• Docs/Config:
  • Add @metamask/messenger dependency and TS project references; update README dependency graph to include messenger and link from network_enablement_controller.
  • CHANGELOG: add BREAKING notes for messenger migration and metadata key rename.

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[mcmire]

LGTM!