[frontend] improve the readability of connector names (#3154)

[frapuks]

Proposed changes

Improve the readability of connector names.

• Display fullname (before : only 40 characters).

Related issues

issue #3154

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

Further comments

• I had to recreate sub-types that had not been individually generated by relay, with potentially null management.
  If you'd like more information, or if you've already encountered this problem and have a better solution, let me know.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (45aabee) 64.76% compared to head (b0360e4) 64.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5707   +/-   ##
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  Coverage   64.76%   64.76%           
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  Files         516      516           
  Lines       60973    60973           
  Branches     4871     4871           
=======================================
  Hits        39489    39489           
  Misses      21484    21484           

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[frapuks]

ready for a 2nd round of reviews

[labo-flg]

Beside the uncanny graphql typing with abusive null, I'm ok for these changes.
Now, if we want to revise the graphql API, this can be as easy as adding a bunch of !, but we need to check the implem backend side never sends null for real

ok with Landry for dismiss to save time