refactor(ui): replace obsolete TextCopy with CodeSnippet in TwoFactorTOTP

[thekishandev]

Current Behavior

The TwoFactorTOTP view component currently relies on the deprecated <TextCopy> component to display the TOTP backup secret string.
This happens to be the absolute final usage of the TextCopy component in the .tsx codebase.

Expected Behavior

The obsolete <TextCopy> component should be replaced with the globally standardized @rocket.chat/fuselage <CodeSnippet> component.
Because this is the final consumer, the TextCopy component itself should be fully unlinked and completely deleted from apps/meteor/client/components/TextCopy to permanently clean up the obsolete architecture and trim the bundle.

Tasks

• Replace <TextCopy> with <CodeSnippet> in apps/meteor/client/views/account/security/TwoFactorTOTP.tsx
• Delete legacy TextCopy component directory entirely from the client codebase.

[coderabbitai]

⚠️ Possible Duplicate Issue(s)

• refactor(account): replace TextCopy with CodeSnippet in TwoFactorTOTP #39110

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