Entity UIs + LaunchDarkly: remove obsolete entity-ui FFs

A number of Feature Flags are no longer needed, eg, the FF is the same value in all environments and is not beneficial to keep around as an "off switch" for a feature.

The following FFs from the Entity UI project can first be removed from the code, and once the code is released to Production, can be removed from LaunchDarkly.

- [ ] [Use Business API GW URL](https://app.launchdarkly.com/projects/entity-ui/flags/use-business-api-gw-url/targeting?env=dev&env=test&env=production&selected-env=test)
- [ ] [Enable Withdrawal Action](https://app.launchdarkly.com/projects/entity-ui/flags/enable-withdrawal-action/targeting?env=dev&env=test&env=production&selected-env=production)
- [ ] [Allow Empty Corrections](https://app.launchdarkly.com/projects/entity-ui/flags/allow-empty-corrections/targeting?env=dev&env=test&env=production&selected-env=production)
- [ ] [Enable SI Dashboard](https://app.launchdarkly.com/projects/entity-ui/flags/Enable-SI-Dashboard/targeting?env=dev&env=production&env=test&selected-env=dev)? _it's Off in all environments; it this feature obsolete?_
- [ ] [Use Business Dashboard](https://app.launchdarkly.com/projects/entity-ui/flags/use-business-dashboard/targeting?env=dev&env=production&env=test&selected-env=test)
- [ ] [Supported AR Correction Entities](https://app.launchdarkly.com/projects/entity-ui/flags/supported-ar-correction-entities/targeting?env=dev&env=production&env=test&selected-env=dev)
- [ ] [Enable Legal Name Fix](https://app.launchdarkly.com/projects/entity-ui/flags/enable-legal-name-fix/targeting?env=dev&env=test&env=production&selected-env=production)
- [ ] [Enable Non-BEN Corps](https://app.launchdarkly.com/projects/entity-ui/flags/enable-non-ben-corps/targeting?env=dev&env=test&env=production&selected-env=dev)
- [ ] [Supported Change of Directors Entities](https://app.launchdarkly.com/projects/entity-ui/flags/supported-change-of-directors-entities/targeting?env=dev&env=test&env=production&selected-env=production)
- [ ] [Supported Change of Address Entities](https://app.launchdarkly.com/projects/entity-ui/flags/supported-change-of-address-entities/targeting?env=dev&env=test&env=production&selected-env=test)
- [ ] [Enable Affiliation Invitation Request Access](https://app.launchdarkly.com/projects/entity-ui/flags/enable-affiliation-invitation-request-access/targeting?env=dev&env=test&env=production&selected-env=production)
- [ ] [Supported Alteration Change Business Types](https://app.launchdarkly.com/projects/entity-ui/flags/supported-alteration-change-business-types/targeting?env=dev&env=test&env=production&selected-env=production)
- [ ] [Supported Restoration Entities](https://app.launchdarkly.com/projects/entity-ui/flags/supported-restoration-entities/targeting?env=dev&env=test&env=production&selected-env=production)
- [ ] [Supported Correction Entities](https://app.launchdarkly.com/projects/entity-ui/flags/supported-correction-entities/targeting?env=dev&env=test&env=production&selected-env=production)
- [ ] [Sentry Enable](https://app.launchdarkly.com/projects/entity-ui/flags/sentry-enable/targeting?env=dev&env=test&env=production&selected-env=production)
- [ ] [Staff Notation Enabled](https://app.launchdarkly.com/projects/entity-ui/flags/staff-notation-enabled/targeting?env=dev&env=test&env=production&selected-env=production)
- [ ] [Supported Dissolution Entities](https://app.launchdarkly.com/projects/entity-ui/flags/supported-dissolution-entities/targeting?env=dev&env=test&env=production&selected-env=production)
- [ ] [Supported Business Summary Entities](https://app.launchdarkly.com/projects/entity-ui/flags/supported-business-summary-entities/targeting?env=dev&env=test&env=production&selected-env=production)
- [ ] [Special Resolution UI Enabled](https://app.launchdarkly.com/projects/entity-ui/flags/special-resolution-ui-enabled/targeting?env=dev&env=test&env=production&selected-env=production)
- [ ] [Enable Digital Credentials](https://app.launchdarkly.com/projects/entity-ui/flags/enable-digital-credentials/targeting?env=dev&env=test&env=production&selected-env=production) _we can use LEAR FF as on/off switch instead_
- [ ] ~[Enable Genesys Web Message](https://app.launchdarkly.com/projects/entity-ui/flags/enable-genesys-web-message-boolean/targeting?env=dev&env=test&env=production&selected-env=production)~ _we should keep this one as a master off switch_
- [ ] [Enable Web Chat](https://app.launchdarkly.com/projects/entity-ui/flags/enable-web-chat-boolean/targeting?env=dev&env=test&env=production&selected-env=production)

This exercise could also be done for Namerequest FFs and SBC-Auth FFs, but those are beyond the scope of this ticket and, actually, the purvue of other teams.