[wp-trac] [WordPress Trac] #38617: Remove unneeded validation callbacks now we have a default

[WordPress Trac]

#38617: Remove unneeded validation callbacks now we have a default
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 Reporter:  joehoyle     |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  4.7
Component:  REST API     |    Version:
 Severity:  normal       |   Keywords:
  Focuses:               |
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 This is a cleanup of all the params to remove the use of
 `rest_validate_request_arg` where it's not needed, also some places were
 doing a custom sanitize callback on enums, which is not needed now either.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38617>
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