Add new PT exemption codes

[cavalle]

• Add new PR exemption codes released ~2 weeks ago

Pre-Review Checklist

• I've read the CONTRIBUTING.md guide.
• I have performed a self-review of my code.
• N/A I have added thorough tests with at least 90% code coverage.
• N/A I've modified or created example GOBL documents to show my changes in use, if appropriate.
• When adding or modifying a tax regime or addon, I've added links to the source of the changes, either structured or in the comments.
• I've run go generate . to ensure that the Schemas and Regime data are up to date.
• All linter warnings have been reviewed and fixed.
• I've been obsessive with pointer nil checks to avoid panics.
• The CHANGELOG.md has been updated with an overview of my changes.
• Requested a review from @samlown.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.83%. Comparing base (06b6c3b) to head (f4c2290).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #607   +/-   ##
=======================================
  Coverage   90.83%   90.83%           
=======================================
  Files         292      292           
  Lines       16429    16429           
=======================================
  Hits        14923    14923           
  Misses       1195     1195           
  Partials      311      311           

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[samlown]

I think these need to be mapped alongside the other codes in the tax combo

[samlown]

Translation is backwards here.

[samlown]

Do you have any clarity on the correct mapping of the VAT key to these codes? Its not very obvious from the outset.

[samlown]

I think it'd be useful here to try and describe what the "exception rules in numbers 7 and following" actually are. All this description is really saying is the same thing as the title, but longer!