Utilize get_target_major_version in no enabled target repositories report

[andywaltlova]

Added the link to shortener, now we have both:

• https://red.ht/preparing-for-upgrade-to-rhel8
• https://red.ht/preparing-for-upgrade-to-rhel9

Disclaimer: I did not test it works, just kinda wanted to improve it when I saw the todo, feel free to close it if the fix required is more complex :)

[github-actions[bot]]

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[pirat89]

@andywaltlova thanks! seems good to me.merging