Team invites - transform email or username to lower case

[joeauyeung]

What does this PR do?

This PR transforms the usernameOrEmail input to be lowercase. Currently, it is case-sensitive, which creates unique users based on the casing.

Fixes #6381

Environment: Staging(main branch) / Production

Type of change

• Bug fix (non-breaking change which fixes an issue)

How should this be tested?

• Invite a user that does not exist to the team via email with alternating casing
  • In the DB the created user email should be lower case

Checklist

• I haven't read the contributing guide
• My code doesn't follow the style guidelines of this project
• I haven't performed a self-review of my own code and corrected any misspellings
• I haven't commented my code, particularly in hard-to-understand areas
• I haven't checked if my PR needs changes to the documentation
• I haven't checked if my changes generate no new warnings
• I haven't added tests that prove my fix is effective or that my feature works
• I haven't checked if new and existing unit tests pass locally with my changes

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Name	Status	Preview	Updated
cal	✅ Ready (Inspect)	Visit Preview	Jan 13, 2023 at 6:58PM (UTC)

[zomars]

Nice catch @joeauyeung 🙏🏽