feat: Projects v2 project items & go-github v79

[nickfloyd]

Depends on: #2891

Resolves #2921

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Before the change?

• After the go-github v77 update there is no projects support

After the change?

• There is now project items support
• The provider is now at go-github v79

Details

Convert/Replace projects to projects v2

Project items resources

• Add project items
• Deprecate project cards
• Make org project read-only
• Deprecate project column

Pull request checklist

• Schema migrations have been created if needed (example)
• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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