Hide validation tab and remove functionality

[ClaireValdivia]

Why is this issue important?

Validation tab is not valuable to users and is also generating errors when used/tested

Current State

Validation is a tab on ARPA with button to "check upload validity" - we have confirmed with users that this is duplicative of the Uploads tab and it is not in use

Expected State

Validation tab should not display to any users

Implementation Plan

The following functions need to be added...

Relevant Code Snippets

No response

[ClaireValdivia]

@TylerHendrickson can you add implementation details on removing code as well for all functionality within the validations tab?

[lsr-explore]

Should hiding it be behind a feature flag? if not, I can just hard code hiding it - we would keep the code in case it needs to be restored.

[ClaireValdivia]

defer to @TylerHendrickson but my recollection of our past conversations is that this code could be removed entirely as a clean-up task. I don't think we need it feature flagged.