Remove usage of temp_await from WorkspaceTests #7124
                
     Merged
            
            
          
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Replace all usage of temp_await with await in WorkspaceTests
Motivation:
async/await is nicer than callbacks. I want to see it more broadly adopted in SPM
Modifications:
All usages of temp_await in the WorkspaceTests target have removed. Where necessary async alternatives have been added and the completion handler methods have been marked no-async. Note: this changed is based on the currently unmerged #7102, but that PR is passing CI and I hope should see no major changes at this point
Result:
async/await adoption in
WorkspaceTests