BREAKING CHANGE:
Positioning utilities have been removed. Consumers should enable the
following Tailwind CSS core plugins:
* `float`
* `inset`
* `position`

Moves the `gl-deprecated-top-66vh` utility to the `deprecated.scss` file
where we can regroup deprecated utils for which we don't yet have a
migration path.

Ensures that Storybook includes Tailwind utilities as well. Also mirrors
GitLab's enabled core plugins in the config.

Migrates internal usages of legacy positioning utilities to their
Tailwind equivalent.

Migrate positioning utilities to Tailwind

Closes #2421

See merge request gitlab-org/gitlab-ui!3990



Merged-by: Lukas 'ai-pi' Eipert <leipert@gitlab.com>
Approved-by: Savas Vedova <svedova@gitlab.com>
Approved-by: Lukas 'ai-pi' Eipert <leipert@gitlab.com>
Reviewed-by: Paul Gascou-Vaillancourt <pgascouvaillancourt@gitlab.com>
Reviewed-by: Savas Vedova <svedova@gitlab.com>
Co-authored-by: Paul Gascou-Vaillancourt <paul.gascvail@gmail.com>

# [77.0.0](gitlab-org/gitlab-ui@v76.1.0...v77.0.0) (2024-02-27)

### Bug Fixes

* migrate internal positioning utilities to Tailwind ([bc9ad6a8](gitlab-org/gitlab-ui@bc9ad6a8))
* remove legacy positioning utilities ([8d0450a9](gitlab-org/gitlab-ui@8d0450a9))

### BREAKING CHANGES

* Positioning utilities have been removed. Consumers should enable the
following Tailwind CSS core plugins:
* `float`
* `inset`
* `position`