perf(upgrade): speeds up migrating remember me codes

The Remember me cookie implementation has been improved by moving codes
to a separate table. This performs that migration in one query.

Fixes #6204
fix(developer_tools): Added all of the defined icons to the theme preview.
fixes(site_notifications): Using the alert icon for notices.

Fixes #6447
chore(scrutinizer): Updated scrutinizer to ignore */vendor/*
fix(views): Using sitedescription in meta description tag.

fixes #3973
Merge pull request #6330 from mrclay/6204

perf(upgrade): speeds up migrating remember me codes

The Remember me cookie implementation has been improved by moving codes
to a separate table. This performs that migration in one query.

Fixes #6204