Provide automated migration scripts for v12 feature flags

[tay1orjones]

Background

For each enable-v12-* flag, an automated migration script (codemod) needs to be written to accompany the changes. Ideally these should be written and provided at (or shortly after) the time of the flag creation, but we already had some v12 flags in the codebase before that was defined in #15964

Solution

For each flag, the codemod should be written in and provided through the upgrade package/cli. The contents of the codemod should assist consumers in making the necessary changes associated with the flag in their codebase. These aren't for our codebase (though we could technically run them on our codebase for testing)

There are already a few codemods written that can be used as guideposts for this work. One thing we should consider is supporting typescript in addition to javascript and including both .js and .ts test fixtures. In some cases we might just need to opening up the filetypes to include .ts and .tsx. Right now most of them only run on .js and .jsx files:

carbon/packages/upgrade/src/upgrades.js

Line 159 in e0382e6

: await glob(['**/*.js', '**/*.jsx'], {

List of flags that need codemods

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1. Research/Write codemod for enable-v12-tile-default-icons #18365
   component: tile role: dev 🤖 +2
   
2. Research/Write codemod for enable-v12-overflowmenu #18121
   component: overflow-menu package: upgrade +2
   
3. Research/Write codemod for enable-v12-tile-radio-icons #18350
   +0
   
4. Research/Write codemod for enable-v12-structured-list-visible-icons #18351
   +0
   
5. Change all slug props to AILabel and write a codemod for these changes #18366
   +0