Remove language_access_language_edit_or_delete function

Problem/Motivation

Parent issue: #2205673: [META] Remove all @deprecated functions marked "remove before 8.0"

Remove language_access_language_edit_or_delete() function definition. Function is deprecated and no longer being used. Also, find the issue/patch that removed the use of this function.

It looks like `language_access_language_edit_or_delete` was only ever used as a callback. Its use was removed by the following issues:

• #2003592: Convert language_admin_add_form and language_admin_edit_form to a Controllers
• #1946426: Convert all of confirm_form() in language.admin.inc to the new form interface

To find out which issue dealt with this particular piece of code I used:

git log -S language_access_language_edit_or_delete core

which tells git to look through the diff of each commit for a string.

Proposed resolution

Remove function from core/modules/language/language.module

Remaining tasks

User interface changes

None.

API changes

None.