feat: notifications push enable updates

[samir-acle]

Explanation

This PR updates notification setup so clients can separate enabling MetaMask notifications from registering for push notifications.

Previously, createOnChainTriggers and enableMetamaskNotifications always attempted FCM/device push registration as part of enabling notifications. Mobile clients need to be able to enable notification preferences without immediately triggering push registration, since OS push permission and FCM registration may happen through a separate native flow.

This PR adds a registerPushNotifications option to the notification enablement options. It defaults to true to preserve existing behavior, but clients can pass false to skip push registration while still enabling MetaMask notifications and initializing notification preferences.

This PR also adds optional os and appVersion metadata to push token registration requests. These values are forwarded to the backend when registering push tokens so Firebase errors can be attributed more precisely by mobile OS and app version.

Other updates:

• Added and updated tests for the new push registration opt-out behavior.
• Updated JSDoc and generated messenger action types.
• Updated the package changelog.

References

https://consensyssoftware.atlassian.net/browse/GE-217
https://consensyssoftware.atlassian.net/browse/GE-211

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
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

[samir-acle]

@metamaskbot publish-previews

[github-actions]

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