test: Add more SELinux testing
test: Add more SELinux testing

Increase test coverage of the SELinux troubleshooting page:
 - Toggle enforcing state
 - Code prepared for alert dismissal / actually running a fix

Closes #4618
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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