[master] Fix unreachable error message with unsupported DNS plugins #65740
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What does this PR do?
Return an error message when the DNS plugin is not supported
What issues does this PR fix or reference?
Fixes: #65739
Previous Behavior
Expected error was in unreachable code
New Behavior
Return error returns properly with the intended message
Merge requirements satisfied?
[NOTICE] Bug fixes or features added to Salt require tests.
Commits signed with GPG?
Yes
Please review Salt's Contributing Guide for best practices.
See GitHub's page on GPG signing for more information about signing commits with GPG.