[7.0] Remove centos 8 images#86477

Merged

carlossanlop merged 3 commits intodotnet:release/7.0from

carlossanlop:BumpUbuntu1604_7

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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