feat: remove legacy user creation modal

[ironAiken2]

Changes:

This PR removes the functionality for adding new users directly from the credential view. Specifically:

• Removed the newUserDialog query and related dialog HTML
• Deleted the _launchUserAddDialog and _addUser methods
• Removed password validation methods: _validatePassword, _validatePassword1, _validatePassword2
• Deleted the _togglePasswordVisibility method

Rationale:

The user creation functionality has likely been moved to a separate component or is being handled differently in the application. This change simplifies the credential view by focusing it on credential management rather than user management.

Impact:

• Administrators will no longer be able to add new users directly from the credential view
• The user interface for the credential view will be cleaner, without the "Add User" dialog
• Any code relying on the removed methods or dialog will need to be updated

Checklist:

• Update documentation to reflect the removal of user creation from the credential view
• Ensure that user creation functionality is available elsewhere in the application
• Test to confirm that credential management features still work as expected
• Verify that removing these elements doesn't break any existing functionality

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[ironAiken2]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat: remove legacy user creation modal #2755 👈
• feat: migrate user list in user credential page to react component #2757 : 1 other dependent PR (#2758 )
• feat: migrate create user modal into react component #2754
• main

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[agatha197]

How about moving this PR to the parent of #2757, and removing the credential view file?

[ironAiken2]

I've organized the stack so that PR #2754 is merged and used first, but I don't think deleting files is relevant to the actual use of the feature, so I'll stack it above #2757 as you said!