feat: added mainnet monad to default getDefaultNetworkEnablementControllerState in network-enablement-controller

[Matt561]

Explanation

Adds mainnet Monad as a default enabled network.

References

• MUSD-784: Mobile: Add Monad to default enabled networks

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

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Note

Low Risk
Low risk: adds a new default-enabled EVM chain (Monad 0x8f) and updates tests/changelog without changing enablement logic.

Overview
Adds Monad mainnet (chain ID 0x8f / 143) to the default enabled EVM network map returned by getDefaultNetworkEnablementControllerState.

Updates the NetworkEnablementController test expectations (and one explicit disableNetwork('0x8f') call in a fallback test) to include Monad in default/derived enabledNetworkMap states, and records the change in the package changelog.

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