planner(migration): support migrating to a completely different node

[csegarragonz]

In this PR we introduce support to migrate an application to a complete different set of nodes if that improves its co-location.

For example, if we have the following deployment:

Node 1: [A][A][B][B]
Node 2: [A][A][C][C]
Node 3: [ ][ ][ ][ ]

before, we would not detect a migration opportunity for app A. Now we do.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d7d8e97) 81.79% compared to head (0afec89) 81.90%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #369      +/-   ##
==========================================
+ Coverage   81.79%   81.90%   +0.11%     
==========================================
  Files         106      106              
  Lines        7997     8013      +16     
==========================================
+ Hits         6541     6563      +22     
+ Misses       1456     1450       -6     

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