Configure liveness, readiness and startup probes for sample applications

[mateusoliveira43]

Remove arbitrary waits from E2E code, by configuring liveness, readiness and startup probes for sample applications.

Example of arbitrary wait:

oadp-operator/tests/e2e/backup_restore_suite_test.go

Lines 146 to 148 in 78f6b7b

	// TODO this should be a function, not an arbitrary sleep
	log.Printf("Sleeping for %v to allow application to be ready for case %s", brCase.AppReadyDelay, brCase.Name)
	time.Sleep(brCase.AppReadyDelay)

Reference: https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/

[mateusoliveira43]

after adding it through #1277, the hardcoded wait is still needed

still need to study more on how to remove arbitrary waits from E2E code

[openshift-bot]

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/lifecycle stale

[kaovilai]

/remove-lifecycle stale

[openshift-bot]

Issues go stale after 90d of inactivity.

Mark the issue as fresh by commenting /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.
Exclude this issue from closing by commenting /lifecycle frozen.

If this issue is safe to close now please do so with /close.

/lifecycle stale

[kaovilai]

/lifecycle frozen

[mateusoliveira43]

Closing this because the only 2 sleeps currently in code have message explaining why they are needed