Remove obsolete feature flags

[Mottie]

Value Statement

As a developer
We want to clean up unused feature flags
So that we can ensure that when the flags are removed, it doesn't effect our forms

Background Context

Several apps include feature flags that need to be investigated and removed:

• form10182_nod - Notice of Disagreement production flag - no longer used, needs to be removed
• omni_channel_link - Claim Status Tool - Discuss status with Omni channel team
• show526_wizard - Form 526 - no longer used, needs to be removed
• va_view_dependents_access - Dependency verification app - need to investigate & discuss with team before removing

Tasks

• Remove un-needed feature flags in forms
• Update mock data
• Update platform feature flags code
• Check unit tests

Definition of done

• All tasks complete
• All tests passing

[Mottie]

Related ticket: #38842