[backend] feat(multi-tenancy): add default tenant migration and foreign keys (#3505)

[damgouj]

Proposed changes

• Add default tenant migration and foreign keys

Testing Instructions

1. OpenAEV must work as before

Related issues

• 3505

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality
• For bug fix -> I implemented a test that covers the bug

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.41%. Comparing base (f4f6ac1) to head (ce04a49).

Additional details and impacted files

@@                  Coverage Diff                  @@
##             release/current    #4979      +/-   ##
=====================================================
+ Coverage              56.38%   56.41%   +0.03%     
- Complexity              4505     4510       +5     
=====================================================
  Files                    999     1000       +1     
  Lines                  29847    29869      +22     
  Branches                2177     2178       +1     
=====================================================
+ Hits                   16828    16852      +24     
+ Misses                 12058    12056       -2     
  Partials                 961      961              

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