Migrate negative margin-y utils to Tailwind

What does this MR do and why?

Migrate negative margin-y utils to Tailwind

Migrates gl-my-n* utils to their -gl-my-* Tailwind equivalents.

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CSS-in-Js diff

diff --git a/config/helpers/tailwind/css_in_js.js b/config/helpers/tailwind/css_in_js.js
index 397076c0d1cb..baa219547cf5 100644
--- a/config/helpers/tailwind/css_in_js.js
+++ b/config/helpers/tailwind/css_in_js.js
@@ -1,5 +1,5 @@
 /**
- * The following 544 definitions need to be migrated to Tailwind.
+ * The following 541 definitions need to be migrated to Tailwind.
  * Let's do this! 🚀
  */
 module.exports = {
@@ -496,11 +496,8 @@ module.exports = {
   '.mx-3\\!': { 'margin-left': '0.5rem !important', 'margin-right': '0.5rem !important' },
   '.my-n1': { 'margin-top': '-0.125rem', 'margin-bottom': '-0.125rem' },
   '.mx-n1': { 'margin-left': '-0.125rem', 'margin-right': '-0.125rem' },
-  '.my-n2': { 'margin-top': '-0.25rem', 'margin-bottom': '-0.25rem' },
-  '.my-n2\\!': { 'margin-top': '-0.25rem !important', 'margin-bottom': '-0.25rem !important' },
   '.mx-n2': { 'margin-left': '-0.25rem', 'margin-right': '-0.25rem' },
   '.my-n3': { 'margin-top': '-0.5rem', 'margin-bottom': '-0.5rem' },
-  '.my-n3\\!': { 'margin-top': '-0.5rem !important', 'margin-bottom': '-0.5rem !important' },
   '.mx-n3': { 'margin-left': '-0.5rem', 'margin-right': '-0.5rem' },
   '.mx-n4': { 'margin-left': '-0.75rem', 'margin-right': '-0.75rem' },
   '.mx-n5': { 'margin-left': '-1rem', 'margin-right': '-1rem' },

Related to #456630 (closed)