New user account validations (#2037)

* force lowercase and no space for new and
 edit user modals

* edit account modal validations

* use pattern for form validation + remove validations from edit user

* revert comment deletions

* comment fix

* update validation message

* update regex
allow updating by block name changes to invalid names

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Co-authored-by: timothycarambat <rambat1010@gmail.com>