Adopt rails 6.1 default `action_view.preload_links_header` (true)
Adopt rails 6.1 default `action_view.preload_links_header` (true)

Determines whether javascript_include_tag and stylesheet_link_tag
will generate a Link header that preload assets.

Note: the config is removed once it sets
ActionView::Helpers::AssetTagHelper.preload_links_header
to true.

see https://github.com/rails/rails/blob/70470d7eed2086169881cc3328693a0f014b03f8/actionview/lib/action_view/railtie.rb#L53

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