Return IMA agent version after migration in schains/containers route

[badrogger]

Changes:

• Return IMA agent version after migration in schains/containers route. If it's not specified, return the regular one.

Peformance:

• No performance changes were introduced.

Unit tests:

• Fixed existing unit test.

Testing:

• Tested on local network by requesting curl http://127.0.0.1:3009/status/schain-containers-versions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5a50774) 80.27% compared to head (371bc01) 80.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##           stable    #1017      +/-   ##
==========================================
+ Coverage   80.27%   80.30%   +0.03%     
==========================================
  Files         101      101              
  Lines        5535     5535              
==========================================
+ Hits         4443     4445       +2     
+ Misses       1092     1090       -2     

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