terminal: increase default scrollback buffer size up to 5000
terminal: increase default scrollback buffer size up to 5000

https://jbs.zendesk.com/agent/tickets/2312435

GitOrigin-RevId: b7ff7df0dbcc8991359d3760cd60a0d15cf1e0d9
allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community