Add `svn:auto-props` for `eol-style` and `mime-type` to `trunk`.

`svn:eol-style` and `svn:mime-type` property default values are now provided for all file types currently in `trunk`.

This also reverts the `eol-style` change to `wp-config-sample.php` made in [46586].

Fixes #42594.
Built from https://develop.svn.wordpress.org/trunk@46636


git-svn-id: https://core.svn.wordpress.org/trunk@46436 1a063a9b-81f0-0310-95a4-ce76da25c4cd