Remove all_claims_add_disabilities_enhancement Feature Toggle

[williamphelps13]

Summary

• This work is behind a feature toggle (flipper): It removes a feature toggle
• Summarize the changes that have been made to the platform: Remove the all_claims_add_disabilities_enhancement feature toggle which was removed from the frontend with this PR: Conditions 671 Remove Previous Add Conditions Content and Feature Toggle #34453

Related issue(s)

• Replace Combobox and All Claims ArrayField with Autocomplete and Platform ArrayField #671

[rmtolmach]

Approving without a teammate review since it's only a flipper removal. this flipper isn't anywhere else in vets-api.

Once this is deployed, you'll need to follow step 3 of this section of this guide to completely remove this toggle. You'll need to do it in the terminal of each ArgoCD environment. If you or no one on your team has access to those terminals, let me know and I can do it for you. Remember, don't delete them in Argo until the code has been deployed.