[6.0] Remove centos 8 images#86478

Merged

carlossanlop merged 4 commits intodotnet:release/6.0from

carlossanlop:BumpUbuntu1604_6

May 23, 2023

Commits on May 19, 2023

Commits on May 22, 2023

Remove Windows.10.Amd64.Core, Windows.7 and Windows.81
carlossanlop
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