[JENKINS-60866][JENKINS-69030] Extract inline JS from 'new-from-list' (#6858)
* [JENKINS-60866] Remove inline JS from 'new-from-list' name validation
* Migrate the rest of the JS, fix autofocusing regression
* Simplify code
Co-authored-by: Daniel Beck <daniel-beck@users.noreply.github.com>
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