Add original manifest to Maven ManifestPatch

[michaelkedar]

Copying the EcosystemSpecific data from the Manifest to the ManifestPatch is a bit cumbersome for the override strategy, and ManifestPatch already has a field for the original manifest.

I don't think the current Maven EcosystemSpecific data is ever going to differ from the what's in the original manifest?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.21%. Comparing base (d9eccf2) to head (03f9a9e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1134      +/-   ##
==========================================
- Coverage   65.24%   65.21%   -0.03%     
==========================================
  Files         162      162              
  Lines       13424    13424              
==========================================
- Hits         8758     8755       -3     
- Misses       4183     4185       +2     
- Partials      483      484       +1     

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