docs(github_repository_tag_protection): Removed documentation for the resource no longer supported by GitHub

[ViacheslavKudinov]

Resolves #2477

Due to decommissioning of Tag protection https://github.blog/changelog/2024-05-29-sunset-notice-tag-protections/

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Before the change?

• Documentation still includes information about github_repository_tag_protection resource which was removed in v6.4.0 of the provider

After the change?

• Documentation for unsupported resource was removed

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• [ x] 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
• [ x] No

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[ViacheslavKudinov]

Hi @kfcampbell
there is one more documentation update to remove "leftovers" about decommissioned github_repository_tag_protection resource.
It will be good to include in the next release as current documentation is misleading by having unsupported resource.
Thank you in advance.