Need fine-grained notifications configuration

[xmo-odoo]

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While it's possible to "Customize email updates", this filtering is not available when getting notifications on github itself (https://github.com/notifications).

That is despite "pull request pushes" (AKA code updates) being largely worthless on github as well, and generally being just spam at best (at worst taking over from and hiding actual comment notifications on the same object, leading to missed notifications).

This is partially related to #15591