Issue 51293: remove useExperimentalCoreUI flag

[labkey-nicka]

Rationale

Removes reference to a long since incorporated experimental flag. Addresses Issue 51293.

Related Pull Requests

• https://github.com/LabKey/labkey-api-js/pull/186
• https://github.com/LabKey/labkey-ui-components/pull/1622
• https://github.com/LabKey/platform/pull/5996
• https://github.com/LabKey/nlp/pull/253

Changes

• Remove functional declaration and serialization
• Bump @labkey/api (via @labkey/components)