🌱 Fix generation of SSM mock #5588
                
     Merged
            
            
          
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What type of PR is this?
/kind cleanup
What this PR does / why we need it:
This got mistakenly broken in #5529. The extra file
ssmiface_mock.gowould be left behind bymake generateand not create an error. I'm reverting this to SSM and a source code filename matching the package directory name.Checklist:
Release note: