ui/profile: display proper errors in send test dialog

[cmarquis]

• Identified the issue which this PR solves.
• Read the CONTRIBUTING document.
• Code builds clean without any errors or warnings.
• Added appropriate tests for any new functionality.
• All new and existing tests passed.
• Added comments in the code, where necessary.
• Ran make check to catch common errors. Fixed any that came up.

Description:
Display proper error messages in the user SendTestDialog

Which issue(s) this PR fixes:
Fixes #2692

Out of Scope:

• Moved the loader into the dialog rather than it hiding in the bottom of the contact methods list. The dialog now opens immediately and has the loader inside of it.
• Removed the generic "try again" error message from the dialog in favor of messages from the API.
• Converted SendTestDialog from Apollo to urql

Screenshots:

Describe any introduced user-facing changes:

• SendTestDialog now opens immediately after pressing the test button and contains the loader inside of it
• Proper error messages will be displayed if there is an error attempting to send a test

Additional Info:

• Now displaying errors from the testContactMethod mutation, if any, in the dialog
• The notification store now returns an error if a test notification is being sent to a contact method not owned by the current user
• Updated tests to pass by matching user to contact method
• Added new tests to verify store functionality

[Forfold]

LGTM. button isn't disabled, but access denied is returned as an error which I think is fine

[mastercactapus]

Fixes the underlying issue, so LGTM.

I think the permission thing can be made better, but that also affects verification, so I'll open a new issue rather than increase the scope.