Remove unused vaos feature toggles

[JunTaoLuo]

Summary

• Remove fully released and unused feature toggles
• United Appointments Experience

Related issue(s)

• Remove va_online_scheduling_cancel Feature Flag va.gov-team#125690
• Consolidate all OH flags into a single Feature flag va.gov-team#130764

Testing done

• N/A

What areas of the site does it impact?

Appointments

Acceptance criteria

• I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• No error nor warning in the console.
• Events are being sent to the appropriate logging solution
• Documentation has been updated (link to documentation)
• No sensitive information (i.e. PII/credentials/internal URLs/etc.) is captured in logging, hardcoded, or specs
• Feature/bug has a monitor built into Datadog (if applicable)
• If app impacted requires authentication, did you login to a local build and verify all authenticated routes work as expected
• I added a screenshot of the developed feature

[simiadebowale]

LGTM

[Copilot]

Pull request overview

Removes VAOS (Appointments) Flipper feature definitions that are believed to be fully released / unused, as part of the “United Appointments Experience” cleanup.

Changes:

• Remove va_online_scheduling_cancel from VAOS Flipper critical-feature logging lists.
• Delete several VAOS/Oracle Health-related Flipper feature definitions from config/features.yml.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
modules/vaos/config/initializers/flipper.rb	Stops treating the removed va_online_scheduling_cancel feature as “critical” for Flipper operation logging.
config/features.yml	Removes multiple VAOS Flipper feature definitions so they’re no longer managed/defined via the repo config.