[release/7.0-rc1] Roll forward to the latest 6.0.x builds

[lewing]

Staging the updates to net7-workload-changes once it is complete in #74018

This bumps the 6.0.x builds to 6.0.9 which aren't in a feed CI can use, disables the tests that would fail as a result, and removes a workaround for the older manifests.

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Issue Details

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Author:	lewing
Assignees:	lewing
Labels:	area-Infrastructure-libraries
Milestone:	-

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Issue Details

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Staging the updates to net7-workload-changes once it is complete in #74018

Author:	lewing
Assignees:	lewing
Labels:	NO-MERGE, area-Infrastructure-mono
Milestone:	-

[lewing]

@dsplaisted this cross release version dependency is going to continue to be a problem

cc @mmitche@marcpopMSFT

[marcpopMSFT]

@dsplaisted this cross release version dependency is going to continue to be a problem

cc @mmitche@marcpopMSFT

@lewing , are you specifically talking about the 6.0.9 part of this PR or something else? This will end up being like the implicit version that the SDK uses. Once we are at GA, you can use msbuild logic so this doesn't have to be updated every month (though it will have to be updated any time the downlevel version doesn't release): https://github.com/dotnet/installer/blob/139aa5903a717425bd909a4cd2d5186eb99c2e2c/src/redist/targets/GenerateBundledVersions.targets#L29

[lewing]

All the impacted lanes are done here, merge at will.