Check duplicates data before adding or creating new backup

[lwin-kyaw]

Explanation

This PR adds a duplicate data check before user adds new SecretData (Mnemonics or PrivateKey).
If the data is already existed in the controller backup state, we will skip adding to the metadata store.

References

Changelog

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, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

[lwin-kyaw]

@metamaskbot publish-preview

[github-actions]

Preview builds have been published. See these instructions for more information about preview builds.

Expand for full list of packages and versions.

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[tuna1207]

lgtm

The base branch was changed.

[chaitanyapotti]

lgtm