'Add User' button and 'No Results Found' message updates

[cadie]

Description
See title. The no results found message has been updated to “No users found. User must log into the events system at least once to be added to a calendar.” and the button to “Add User to Calendar” along with necessary layout/column/width adjustments to account for that.

Motivation and Context
To hopefully aide in helping users recognize that a user must log in to the Events system with their NID before they are able to be added to calendars. This will also hopefully result in fewer emails sent to the Webcom team for assistance with this.

How Has This Been Tested?
In dev.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires an update to the documentation.
• I have updated the documentation accordingly.