Fixed #23357 -- Added small int introspection support to MySQL backend.

In the MySQL backend, updated the can_introspect_small_integer feature
flag to True. In data_types_reverse, map FIELD_TYPE.SHORT to a
SmallIntegerField. Added test to verify introspecting SmallIntegerFields
and fixed existing tests influenced by this change.
Fixed #23349 -- Clarified details about RunPython's apps argument.
Removed an unused import.
Fixed #23329 -- Allowed inherited and m2m fields to be referenced in the admin.

Thanks to Trac alias Markush2010 and ross for the detailed reports.
Fixed #23374 -- Renamed StaticLiveServerCase to StaticLiveServerTestCase

Refs #20739. Thanks Raphaël Hertzog for the report and the initial
patch.
Fixed #23375 -- Added missing security issues to the archive.

Also adjusted the pre-release process to prevent future omissions.
Factorize some code using ContextDecorator.
Fixed #23323 -- Made django.utils.translation.override usable as a decorator.
Fixed #23379 -- Corrected a referencing issue in sql_create.

Thanks to Trac alias flakfizer for the report.
Documented correct kwargs for post_syncdb/migrate.

d562527a rename the db to using in the wrong signal.

Thanks Maik Hoepfel for the report.
Fixed #23381 -- Context manager restored state should be determined in __enter__
Fixed an Oracle test failure introduced by 1e404180c1.
Fixed #22786 -- Documented value_from_datadict caveat

Thanks blueyed for the report and Tim Graham for the review.
Fixed #23313 -- Corrected repr(RawQuery) with dict parameters.
Clarified a comment in django.core.files.temp.
Removed unnecessary release notes for django.utils.translation.override().

Undocumented functions don't need to be mentioned.
Fixed #21201 -- Improved customization of ClearableFileInput.
Fixed flake8 warning.
Fixed #21483 -- Added WSGI environ to kwargs sent to request_started signal.
Fixed a typo in the 1.8 release notes.