Allow overriding permissions strings for other entities [#3330812]

Problem/Motivation

The revision overview uses a few permissions to determine whether the user may revert and delete revisions. These strings are fixed to using only the bundle of the entity. This is fine for media and taxonomy terms, but our custom entity uses the entity type id as well in these strings.

Proposed resolution

Extract the permission string into a protected method to allow overriding it.

Remaining tasks

User interface changes

API changes

Data model changes

Issue fork entity_diff_ui-3330812

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3330812-overriding-permissions changes, plain diff MR !1
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