Move to new branch protection mechanism

[matmair]

The OSSF scorecard action for branch protection requires extra steps to work for classic branch protection and rather than giving the required extra access I would recommend switching to the new mechanism.

GitHub docs for rules
Importing a ruleset

The rules for InvenTree would be here: https://github.com/InvenTree/InvenTree/settings/rules

My recommended ruleset is as follows main branch.json

[matmair]

@SchrodingersGat