feat(multichain-account-service): add deleteAccount to providers

[hmalik88]

Explanation

The removeMultichainAccountWallet method was updated to properly delete all associated accounts with a wallet. The deleteAccount method was added to the providers to facilitate this.

References

N/A

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

High Risk
Breaking messenger API plus multi-provider account deletion and keyring/snap removal paths are security- and data-sensitive; partial failures are swallowed while the wallet is still removed from service state.

Overview
Adds deleteAccount(id) to the Bip44AccountProvider contract and wires it through EVM (v2 HD keyring.deleteAccount), snap providers (SnapKeyring.removeAccount), and AccountProviderWrapper (always forwards, including when disabled). AccountProviderWrapper also gains unwrap() so wallet removal can list underlying snap accounts when basic functionality is off.

BREAKING: removeMultichainAccountWallet / MultichainAccountService:removeMultichainAccountWallet now take only entropySource (the accountAddress argument is removed). Removal walks every provider, deletes all accounts for that wallet via deleteAccount, uses unwrap() for enumeration when wrappers are disabled, reports one aggregated captureException on partial failure, and still drops the wallet from the service map. Changelog and tests cover multi-provider cleanup, disabled-wrapper behavior, and error aggregation.

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