Backport PR#4224 onto v3.13.x (Add .NET7 as a build target for the test suite) #4302
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Fixes #4170
Backports the fix from PR #4224 onto the v3.13 branch
BUILDING.md was omitted as the file in the 3.13 branch doesn't contain the directory output. The Github Actions yaml file had a few minor updates applied by me in a subsequent commit to make it consistent with other recent changes in that file (setup emoji and targeting
@3
of thesetup-dotnet
action)