prevent cli from sending request when no user is found for provided email

[aliotta]

Description

prevent cli from sending request when no user is found for provided email

🎟 Issue(s)

Related #XXX

🧪 Functional Testing

List the functional testing steps to confirm this feature or fix. Tested the following against dev.

• Attempted to update a deployment users role using an email address that did not exist in the org.

📸 Screenshots

Add screenshots to illustrate the validity of these changes.

📋 Checklist

• [ ] Rebased from the main (or release if patching) branch (before testing)
• [ ] Ran make test before taking out of draft
• [ ] Ran make lint before taking out of draft
• [ ] Added/updated applicable tests
• [ ] Tested against Astro-API (if necessary).
• [ ] Tested against Houston-API and Astronomer (if necessary).
• [ ] Communicated to/tagged owners of respective clients potentially impacted by these changes.
• [ ] Updated any related documentation

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.57%. Comparing base (f48a2a0) to head (fd50fb3).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1617 +/- ## ========================================== + Coverage 86.56% 86.57% +0.01% ========================================== Files 114 114 Lines 16088 16090 +2 ========================================== + Hits 13926 13930 +4 + Misses 1297 1296 -1 + Partials 865 864 -1 ```

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