Add gateway listeners scaling test

[averevki]

Changes

• Overwrite wait_for_ready for DNSPolicy with timeout increased to 5 min instead of 1 min, large amount of DNS records take some time to create
• Create 2 gateways with max listeners and see if both dns policies are enforced and some random listeners are reachable

Closes #528

[trepel]

I am approving this one. However, it failed for me twice out of ~8 times so the 300s timelimit might need to be increased. We can adjust based on flakiness we observe in nightly pipelines.

[averevki]

I am approving this one. However, it failed for me twice out of ~8 times so the 300s timelimit might need to be increased. We can adjust based on flakiness we observe in nightly pipelines.

I expect some problems with this test due to a large amount of DNS records getting created/deleted. I too am getting timeouts sometimes when I'm trying to run this test again right after the execution. I hope nightlies will handle a single run of this test in parallel with other ones

[averevki]

rebase^

[trepel]

• Overwrite wait_for_ready for DNSPolicy with timeout increased to 5 min instead of 1 min, large amount of DNS records take some time to create

LGTM, I just can't see any wait_for_ready being overridden so I am a bit confused. You probably mean that wait_for_full_enforced were overridden (which is used in wait_for_ready)