fix(backend): added /healthz to FORBIDDENPATH in createWalletAddress

[elena-petridou]

Changes proposed in this pull request

• added /healthz to FORBIDDENPATH in createWalletAddress

Context

Added /healthz to the list of forbidden paths during wallet address creation in the backend service. Fixes #3640

Since FORBIDDENPATHS is exported and used in the tests, the test case is already covered

Checklist

• Related issues linked using fixes #number
• Tests added/updated
• Make sure that all checks pass
• Bruno collection updated (if necessary)
• Documentation issue created with user-docs label (if necessary)
• OpenAPI specs updated (if necessary)

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