Rename PostCSS files to .pcss (#9013)
* Rename PostCSS files to `.pcss` * Make Stylelint happy * Delint * Rename new files too * delint * Fix bad comment placement
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.pcss (#9013)
* Rename PostCSS files to `.pcss` * Make Stylelint happy * Delint * Rename new files too * delint * Fix bad comment placement