TypeScript migration, final tasks

[matthewgallo]

We're almost finished migrating all released components to typescript. We have a few more steps once that is complete to finish (following core's lead from carbon-design-system/carbon#16360)

Final tasks for typescript support

Preview Give feedback

1. Export types for TypeScript components #5721
   adopter: automation adopter: data & ai adopter: security adopter: sustainability area: typescript +5
   
2. Rename all component index.js files to index.ts #5722
   adopter: automation adopter: data & ai adopter: security adopter: sustainability area: typescript +5
   
3. Once all components are exported as .ts, update the root index.js to index.ts, and ensure all type exports are made available from the root - e.g. import { type AboutModalProps } from '@carbon/ibm-products'; #5723
   adopter: automation adopter: data & ai adopter: security adopter: sustainability area: typescript +5
   
4. Ensure all components have an .d.ts file in the build output #5724
   adopter: automation adopter: data & ai adopter: security adopter: sustainability area: typescript +5
   

[matthewgallo]

Final tasks have been completed, any further issues the come up we can open new issues.