[frontend] use context to prefill the dynamic entity mapping column

[CelineSebe]

Proposed changes

• add CsvMapperContext to pass the dynamicMappingColumn to the others representation
• add onToggleDynamicMapping to set the dynamicMappingColumn
• add useState to modify the value of the dynamicMappingColumn

Related issues

• 7400

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case (coverage and e2e)
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.00%. Comparing base (00813e7) to head (bec31fd).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9087      +/-   ##
==========================================
- Coverage   65.01%   65.00%   -0.01%     
==========================================
  Files         624      624              
  Lines       59520    59520              
  Branches     6597     6593       -4     
==========================================
- Hits        38695    38690       -5     
- Misses      20825    20830       +5     

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[lndrtrbn]

• Warnings and errors in console while manipulating the fields for dynamic mapping to fix,
• You cannot empty the fields Column index and Operator,
• What column should be kept in the context ? The first one set or the last one ? Currently it is the last one