Trim whitespace when inviting a new user by email

What does this MR do?

Trims whitespace when inviting a new user by email

Screenshot

before:

after:

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides

Closes #52194 (closed)