Add Apache 2.0 license headers to Fetch Migration python code

[kartg]

Description

Adds a short Apache 2.0 license header to Fetch Migration source code and unit tests. No functionality changes.

Check List

• New functionality includes testing
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f8dcf96) 73.24% compared to head (5cba5a9) 73.22%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #436      +/-   ##
============================================
- Coverage     73.24%   73.22%   -0.03%     
  Complexity     1056     1056              
============================================
  Files           112      112              
  Lines          4527     4527              
  Branches        417      417              
============================================
- Hits           3316     3315       -1     
  Misses          954      954              
- Partials        257      258       +1     

Flag	Coverage Δ
unittests	73.22% <ø> (-0.03%)	⬇️

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[kartg]

Codecov is failing due to unrelated Java code