Fix init command migration

[thelovekesh]

• Add a fix to remove duplicate team and tags items.
• Fix base64 encoding of readme before adding to manifest.

[github-actions]

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[Copilot]

Pull request overview

This PR fixes issues in the init command migration by addressing duplicate handling and readme encoding. The changes ensure proper deduplication of team members and tags, validate plugin dependencies, and correct the readme content format.

• Added validation and deduplication logic for tags and team members to prevent duplicates
• Fixed readme content to use plain string instead of base64 encoding
• Added validation for RequiresPlugins to filter out invalid plugin names

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
cli/command/publish/publish.go	Removed base64 encoding from readme content, returning plain string instead
cli/command/init/init.go	Added RequiresPlugins validation, implemented deduplication for tags and team using sorted slices with slices.Compact

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