e2e/flake: TestE2E_Multicast_Publisher/connect/check_post_connect/check_s_comma_g_is_created

[snormore]

Examples:

• https://github.com/malbeclabs/doublezero/actions/runs/16938880278/job/48002277156
• https://github.com/malbeclabs/doublezero/actions/runs/16944854216/job/48023131047

=== NAME  TestE2E_Multicast_Publisher/connect/check_post_connect/check_s_comma_g_is_created
    multicast_publisher_test.go:185: 
        	Error Trace:	/home/ubuntu/actions-runner/_work/doublezero/doublezero/e2e/multicast_publisher_test.go:185
        	Error:      	Condition never satisfied
        	Test:       	TestE2E_Multicast_Publisher/connect/check_post_connect/check_s_comma_g_is_created
        	Messages:   	multicast group 233.84.178.0 not found in mroutes