add external links to the leapp-report.txt

[PeterMocary]

The external links were only included in the leapp-report.json and its .txt version was lacking this essential information. I didn't find any other problems regarding the information that is not included in one or the other format. Although the OAMG-9665 seems to be related to this. Do you think that it should be fixed in this PR as well?

Jira: OAMG-8553

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[pirat89]

/packit build