refactor(backend) rename barcode plugins

[matmair]

Following development in #9761 and feedback in #9827 this renames the current barcode plugins.
Note: this only changes names on new instances of the plugin config.

The docs were already addressed in #9828

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.57%. Comparing base (4d029b0) to head (ba61faf).
⚠️ Report is 321 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9829   +/-   ##
=======================================
  Coverage   86.56%   86.57%           
=======================================
  Files        1243     1243           
  Lines       54683    54687    +4     
  Branches     2230     2230           
=======================================
+ Hits        47337    47343    +6     
+ Misses       6780     6778    -2     
  Partials      566      566           

Flag	Coverage Δ
backend	88.52% <100.00%> (+<0.01%)	⬆️

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[30350n]

FYI, I choose the names like that back then to leave the option for these plugins to implement other supplier related functionality/interfaces ... so pretty much exactly what's being implemented in #9761 rn. I would generally be interesting in looking into implementing them for atleast some of the suppliers, so I'm unsure how much sense this change would make now.

[matmair]

It leads to confusion right now and the function is not there. We are gearing up for 1.0 so I’d like to get this sorted before

[SchrodingersGat]

Won't renaming the slugs mean that any users who have this already "enabled" will find these plugins are now disabled on update?

[matmair]

These are the current slugs, they were added to ensure that settings etc stay consistent

[SchrodingersGat]

@matmair ah, on a second read through I see the logic :)