Stablize remote staging tests

• Type: Testing
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: None
• Component/s: Asset Libraries
• Labels: None
• Story Points: 5
• Sprint: LIMA | QA Sprint 12
• Testing Type: Automation

Some remote staging tests failed at "Sidecar Elasticsearch process is aborted", because the system is running out of memory.
Example: https://testray.liferay.com/zh/home/-/testray/case_results/index?p_p_state=normal&orde[...]yTeamId=1310723367&testrayRunId=1553991882&issues=LRCI-2248

We will make those tests run on 24gb slaves to make them more stable.