feat(snap-account-service): add deferred promise for :getLegacySnapKeyring

[ccharly]

Explanation

Avoid having multiple consumers locking the KeyringController mutex during keyring initialization.

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

[ccharly]

@metamaskbot publish-preview

[github-actions]

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