IFC-1305 Remove permission identifier custom code

[gmazoyer]

This change cleans up the custom code we used to have to generate permission identifiers. These are now replaced by display labels (brought by #8039).

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[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing gma-20260206-ifc1305-bis (903ef85) with develop (e64e399)}

Summary

✅ 12 untouched benchmarks

[ogenstad]

Do we need a migration or state=absent here for this to be removed from existing installations?

[gmazoyer]

We sure do we have the backend/infrahub/core/schema/definitions/deprecated.py file for that it seems.