[Django] #36330: Allow specifying DATABASES["default"]["TEST"]["ENGINE"]

[Django]

#36330: Allow specifying DATABASES["default"]["TEST"]["ENGINE"]
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Reporter: Collin Anderson | Type: New
| feature
Status: new | Component: Testing
| framework
Version: 5.2 | Severity: Normal
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Would be nice to be able to set `DATABASES["default"]["TEST"]["ENGINE"] =
"django.db.backends.sqlite3"` for running tests in an in-memory database.

See also #30084: Setting `DATABASES['default']['TEST']['engine']` to
SQLite does not cause Django to use an in-memory database as expected
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Ticket URL: <https://code.djangoproject.com/ticket/36330>
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