Remove name and uniqueness in redirect condition table

[acelaya]

Part of #1914

During the implementation of the API to handle redirect rules and conditions, it was made obvious that a normalized version of rules<->relation_table<->conditions would not be as easy to handle, so I thought it would make more sense to switch from a many-to-many relationship to a one-to-many.

However, we want rules to know about conditions, but not the other way around, and Doctrine does not handle inversed unidirectional one-to-many relationships so well.

Because of that, this keeps the many-to-many relationship, but refactoring it so that conditions are not unique nor shared between rules anymore. Instead, every rule will have its conditions, that will be removed when orphaned.

That requires removing the name filed from conditions, which acted as a unique key, and making conditions to cascade persist, as they will always be created together with "their" rule.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.19%. Comparing base (ab7824a) to head (070d748).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #2035      +/-   ##
=============================================
- Coverage      97.20%   97.19%   -0.01%     
  Complexity      1317     1317              
=============================================
  Files            245      245              
  Lines           4578     4571       -7     
=============================================
- Hits            4450     4443       -7     
  Misses           128      128              

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