Increase the wait timeout to 20 minutes while syncing applications

[varshab1210]

What type of PR is this?

Uncomment only one /kind line, and delete the rest. For example, > /kind bug would simply become: /kind bug

/kind bug /kind cleanup /kind failing-test /kind enhancement /kind documentation /kind code-refactoring

What does this PR do / why we need it:

I am trying to add OCP 4.10 and 4.11 into Openshift CI. The jobs seem flaky while rehearsing them and sometimes fail due to timeout.

https://prow.ci.openshift.org/view/gs/origin-ci-test/pr-logs/pull/openshift_release/27689/rehearse-27689-pull-ci-redhat-developer-kam-master-v4.10-integration-e2e/1513752196313780224#1:build-log.txt%3A982

https://prow.ci.openshift.org/view/gs/origin-ci-test/pr-logs/pull/openshift_release/27689/rehearse-27689-pull-ci-redhat-developer-kam-master-v4.11-integration-e2e/1513752196724822016#1:build-log.txt%3A927

Have you updated the necessary documentation?

• [ ] Documentation update is required by this PR.
• [ ] Documentation has been updated.

Which issue(s) this PR fixes:

Fixes #?

How to test changes / Special notes to the reviewer:

[openshift-ci[bot]]

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