Add current source-build prebuilts to support offline builds #14261
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Building offline surfaced two issues.
UpdateNuGetConfigPackageSourcesMappings
task didn't support offline correctly for two reasons. First, a clear element was getting added after each source-build packageSourceMapping if a clear didn't previously exist. Second, the source-build packageSourceMappings contained no packages in offline. This was caused by the use of LINQ and deferred evaluation. The online packageSourceMappings were removed prior to enumerating the LINQ statement.