RHOAIENG-15772: tests(odh-nbc) significantly reduce the amount of sleeping in tests

[jiridanek]

https://issues.redhat.com/browse/RHOAIENG-15772

Relates to

• Upgrade ginkgo test with use of Eventually instead of time funcs  #380

Description

• remove time.sleep()s and rely on Eventually
• shorten the interval constant so that we check more frequently
• leaving one sleep that seems necessary for the tests (!)
• and two more sleeps that are a workaround for flakyness

This PR depends on

• RHOAIENG-15772: tests(nbcs): use the direct (uncached) client to drive tests #461

because with the caching client, a check for resource passes (resource is in cache) but server-side patching fails (resource is not yet on server). For example this one

kubeflow/components/odh-notebook-controller/controllers/notebook_controller_test.go

Lines 840 to 841 in 2555813

	patch := client.RawPatch(types.MergePatchType, []byte(`{"spec":{"to":{"name":"foo"}}}`))
	Expect(cli.Patch(ctx, route, patch)).Should(Succeed())

and also the create-get does not work well

kubeflow/components/odh-notebook-controller/controllers/notebook_controller_test.go

Lines 331 to 336 in 2555813

	By("By creating a new Notebook")
	Expect(cli.Create(ctx, notebook)).Should(Succeed())
	By("By updating the Notebook's image")
	key := types.NamespacedName{Name: Name, Namespace: Namespace}
	Expect(cli.Get(ctx, key, notebook)).Should(Succeed())

How Has This Been Tested?

make test

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

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[jstourac]

/lgtm

[jiridanek]

This makes the tests more flaky than they are now, so I plan to sit on it a while, until I get other (more important) things merged in opendatahub-io/notebooks.