Fluid inputs: remove from experimental, mark as stable

[tay1orjones]

Fluid Inputs were delivered in #5416 behind an experimental/unstable flag.

We should consider moving these to stable after we've received feedback on the components, their API, usage docs, styling, etc.

Tasks

Beta Give feedback

1. Consider if we have any changes we need to make to these components based on feedback during the experimental period
2. If ready, review the documented "Moving to stable" checklist that outlines what must be done to move these components to stable
3. Add a11y and VRT tests for them now that we can use controls in the visitStory() function for e2e tests.
4. Copy that checklist into this issue (when ready to work on this)
5. Make any changes as necessary to fluid input components (based on the checklist)
6. Announce stability in changelog and slack blasts after release
7. Add TypeScript types to all Fluid components #17196
   12 of 12
   area: typescript package: @carbon/react role: dev 🤖 type: infrastructure 🤖 +4
   
8. FluidSearch and FluidSearchSkeleton aren't being exported #16809
   component: search role: dev 🤖 severity: 2 type: bug 🐛 +4
   
9. [FluidTextInput]: missing enableCounter #16938
   component: text-input +1
10. [FluidComponents]: missing readOnly state #16939
    component: text-area +1
    

[tay1orjones]

Marked as blocked and needs more info because we won't be moving these to stable until they've been published for a while and we've received feedback on these components.

If there's not been any feedback for changes needed for a while, we can consider this issue to move them to stable.

[tay1orjones]

We might want to consider waiting for #13682 to land before we mark these stable

[tay1orjones]

There's no longer a hard blocker on this one. Converting it to an umbrella issue as there's quite a few moving pieces to complete here.