IA-3893 Extract plugins permissions from main codebase

[mathvdh]

Currently plugins permissions are in the main codebase in hat/menupermissions.
This is an attempt to extract them into the plugin codebase without breaking everything and provide an example and the mechanisms to do it for other plugins like trypelim.

Related JIRA tickets : IA-3893

Self proofreading checklist

• Did I use eslint and black formatters
• Is my code clear enough and well documented
• Are my typescript files well typed
• New translations have been added or updated if new strings have been introduced in the frontend
• My migrations file are included
• Are there enough tests
• Documentation has been included (for new feature)

Doc

See in ...

Changes

• Extract POLIO permissions from hat/menupermissions
• Put into POLIO_PLUGIN_ROOT/permissions.py
• Create a new Permissions "fake" model for Polio.
• Create a "fake" migration for this model.
• Create a custom migration to change all the permissions from the old one to new one for each user.
• Modifications to hat/menupermissions to load pernissions from plugins.

How to test

Nothing should change for the user and all polio pages should still work normally.

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fix: empty instance pop up

Refs: IA-3665

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