Fix intermittent failures in ResourceInitialSelectionTest by waiting for async jobs#3372

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copilot/fix-808dce0d-74f2-4a09-b589-ab49e2b6087aeclipse-platform/eclipse.platform.ui:copilot/fix-808dce0d-74f2-4a09-b589-ab49e2b6087aCopy head branch name to clipboard