feat(solana-wallet-snap): use shareable permissions helpers in Solana snap

[Julink-eth]

Explanation

Replace the Solana snap’s local origin-permission map wiring and validateOrigin with the shared helpers from @metamask/snap-networks-utils.

• permissions.ts still owns the method lists and the ConfigProvider local/test toggle. The map is built with createOriginPermissions: localhost + dapp methods in non-prod, Portfolio + empty dapp set in prod.
• onRpcRequest and onKeyringRequest call validateOrigin(origin, method, originPermissions) from the shared package. The local wrapper in validators.ts is removed.
• Unused @typescript-eslint/only-throw-error suppressions for that file are pruned (they existed only for the deleted UnauthorizedError throws).
  Permission surface is unchanged.

References

• Related to WPN-1924
• Follows feat: create a shared origin permission method (#193)

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

[Julink-eth]

@metamaskbot publish-preview

[Julink-eth]

@metamaskbot publish-preview

[github-actions]

Preview builds have been published. Learn how to use preview builds in other projects.

Expand for full list of packages and versions.

@metamask-previews/bitcoin-wallet-snap@2.0.1-preview-0897653c
@metamask-previews/snap-networks-utils@1.0.0-preview-0897653c
@metamask-previews/solana-wallet-snap@6.0.0-preview-0897653c
@metamask-previews/stellar-wallet-snap@0.1.0-preview-0897653c
@metamask-previews/tron-wallet-snap@3.1.0-preview-0897653c