Revert "Load Microsoft.DotNet.MSBuildSdkResolver into default load context (MSBuild.exe only) (#9439)"

[JanKrivanek]

Likely a red herring - closing (a separate issue will be opened for an unrelated issue hit with that change)

This reverts commit 6257b8e.

Context

• https://dev.azure.com/devdiv/DevDiv/_workitems/edit/1931676
• https://portal.microsofticm.com/imp/v3/outages/details/452776892/overview
  Latest VS main msbuild fails to restore VS sources.

Testing

For a quicker test loop I was testing only on a specific project:

.\MSBuild.exe /t:Restore C:\src\VS\src\vset\Agile\TestPlatform\RocksteadyCLI\Rocksteady.csproj

With the latest VS main (17.9.0 Preview 3.0 [34422.22.main]) it received bunch of NU1604 and NU1103 - showing that dependencies versions were not properly resolved.
When injected msbuild build on latest vs17.9 - the same symptomps remained.
When injected backsynced msbuild or msbuild from latest vs17.9 with reverted #9439 - the issues disappeared

With previous VS main (17.9.0 Preview 3.0 [34414.216.main]) - the issue doesn't repro
With previous VS main with injected msbuild build on latest vs17.9 - the same symptomps remained.

With the latest VS main (17.9.0 Preview 3.0 [34422.22.main]) it received bunch of NU1604 and NU1103 - showing that dependencies versions were not properly resolved.
When injected msbuild build on latest vs17.9 - the same symptomps remained.
When injected backsynced msbuild or msbuild from latest vs17.9 with reverted #9439 - the issues is still there (so likely that change is not a culprit)
When injected backsynced msbuild prior the inserted commits (to fcff9b0) - the issues is still there (so likely no msbuild change is a culprit)

With previous VS main (17.9.0 Preview 3.0 [34414.216.main]) - the issue doesn't repro
With previous VS main with injected msbuild build on latest vs17.9 - there is a different issue:

C:\src\VS\Directory.Build.props(201,3): error : Could not resolve SDK "Microsoft.DevDiv.DownloadTasks". Exactly one of the probing messages below indicates why we could not resolve the SDK. Investigate and resolve that message to correctly specify the SDK.
C:\src\VS\Directory.Build.props(201,3): error :   The NuGetSdkResolver did not resolve this SDK because there was no version specified in the project or global.json.
C:\src\VS\Directory.Build.props(201,3): error :   MSB4276: The default SDK resolver failed to resolve SDK "Microsoft.DevDiv.DownloadTasks" because directory "C:\Program Files\Microsoft Visual Studio\2022\main-2\MSBuild\Sdks\Microsoft.DevDiv.DownloadTasks\Sdk" did not exist.
C:\src\VS\Directory.Build.props(201,31): error MSB4236: The SDK 'Microsoft.DevDiv.DownloadTasks' specified could not be found. [C:\src\VS\src\vset\Agile\TestPlatform\RocksteadyCLI\Rocksteady.csproj]

That issue dissapears when the #9439 is reverted. - that originaly misslead me to think it's a culprit. But it seems completely unrelated

Analysis

TBD - (separate item will be created)

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