Users page: copy user email addresses

[roseeichelmann]

Associated issues

Closes cityofaustin/atd-data-tech#20121

Testing

URL to test:
Local - you will need to run the users api and also update isValidUser in api/server.py to return true until john gets rid of that function

Steps to test:

1. Go to the users page. While the users are loading you should see a spinner and not see the buttons. Once the users load, you see the buttons.
2. Click on the copy emails button, check that they copied to your clipboard. Make sure test accounts arent being included.
3. Navigate to crashes and back to users. While isValidating is true there will be a spinner by the buttons and they should be disabled.

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Ship list

• Check migrations for any conflicts with latest migrations in main branch
• Confirm Hasura role permissions for necessary access
• Code reviewed
• Product manager approved

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[roseeichelmann]

disable the buttons while we are showing the isValidating spinner (different from the isLoading spinner which is for loading all the users in the table)