Deprecate utility mixins in position.scss

As part of the Tailwind CSS migration initiative, we are deprecating existing utility mixins by changing their gl- prefixes to gl-deprecated-.

This issue is about deprecating mixins declared in src/scss/utility-mixins/position.scss.

Changes summary

Updated December, 4th 2023

281 files changed, 445 insertions(+), 445 deletions(-)

Tailwind core plugins needed

• position
• Need to figure out what plugin top/right/left/bottom is in

Implementation steps

• Make sure that your local GDK is up-to-date and that you don't have any work in progress there. Copy the gitlab/ directory absolute path to be used in the next step.
• Run the deprecation script against position.scss:

  node bin/deprecate_utils.js position.scss <path/to/gdk/gitlab/>

• Enable Tailwind CSS core plugins that provide replacements for the now-deprecated utils.
• Commit and push the GitLab UI changes. Make sure to mark them as BREAKING.
• In the GDK, create a new branch and install the dev build of @gitlab/ui. This will serve as the integration branch. Commit and push the changes, create an MR. Link to the integration MR in the GitLab UI MR.
• Put both MRs out for review.