refactor(ButtonBase): To use CSS modules behind the feature flag (#4940)

* copy

* setting

* Create olive-donkeys-exercise.md

* test(vrt): update snapshots

* update tests

* we got this

* vrt dont lie

* test(vrt): update snapshots

* more fixes

* fix focus outline

* where where where

* fix nesting

* fix nesting i think

* test vrt

* cleanup

* important...

* try reverting this change?

* try resetting stories

* reset from main

* fix classname on iconbutton

* try no calc

* more digits??

* test(vrt): update snapshots

* lets goooooo

* oops

* reset

* Revert "reset"

This reverts commit b82f00c.

* reset

* test(vrt): update snapshots

---------

Co-authored-by: langermank <langermank@users.noreply.github.com>

.changeset/olive-donkeys-exercise.md

@@ -0,0 +1,5 @@
+---
+"@primer/react": major
+---
+
+Refactor ButtonBase component to use CSS modules behine flag

.vscode/settings.json

@@ -10,6 +10,13 @@
   "[typescriptreact]": {
     "editor.defaultFormatter": "esbenp.prettier-vscode"
   },
+  "[postcss]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode",
+    "editor.formatOnSave": true,
+    "editor.codeActionsOnSave": {
+      "source.fixAll.stylelint": "explicit"
+    }
+  },
   "json.schemas": [
     {
       "fileMatch": ["*.docs.json"],